CN112254313B - Air conditioner and alternating voltage detection method - Google Patents
Air conditioner and alternating voltage detection method Download PDFInfo
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- CN112254313B CN112254313B CN202010923629.9A CN202010923629A CN112254313B CN 112254313 B CN112254313 B CN 112254313B CN 202010923629 A CN202010923629 A CN 202010923629A CN 112254313 B CN112254313 B CN 112254313B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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Abstract
The invention discloses an air conditioner and an alternating voltage detection method, wherein a main control MCU of the air conditioner is configured as follows: when the air conditioner is connected with an alternating current power supply and is not started, receiving a first voltage detection signal sent by an alternating current voltage detection module; if the first voltage detection signal exceeds the preset range, a fault signal is output and the air conditioner is refused to start, so that the air conditioner can accurately detect the alternating voltage in a standby state, and the reliability of the outdoor unit controller is improved.
Description
Technical Field
The present disclosure relates to the field of air conditioner control, and more particularly, to an air conditioner and an ac voltage detection method.
Background
In an air conditioner product, an outdoor unit controller can realize control by using two chips: a main control MCU and a drive MCU. The master control MCU and the drive MCU can communicate with each other to realize different functions respectively. The alternating current bus voltage detection function is performed by the driving MCU, and the detection result is informed to the main control MCU in a communication mode. In the design scheme, in order to realize low standby power consumption, when the air conditioner is connected with an alternating current power supply but does not receive a starting instruction, the circuit power supply on one side of the driving MCU is disconnected, and only after the starting instruction is received, the circuit power supply on one side of the driving MCU is turned on. Therefore, when a product with a 220V power supply is mistakenly connected to a 380V power supply under the condition of no startup, the main control MCU cannot detect the alternating voltage, so that the abnormality of the alternating voltage cannot be known, corresponding components are damaged for a long time, and the reliability of the outdoor unit controller is reduced.
Therefore, how to provide an air conditioner that can enable the main control MCU to accurately detect the ac voltage without supplying power to the driving MCU, so as to improve the reliability of the outdoor unit controller, is a technical problem to be solved at present.
Disclosure of Invention
The invention provides an air conditioner, which is used for solving the technical problem that the alternating voltage cannot be detected under the condition that a driving MCU (microprogrammed control Unit) does not supply power in the prior art.
The air conditioner includes:
the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the heat exchangers operates as a condenser and the other operates as an evaporator;
the indoor unit controller is used for controlling the indoor unit and sending the on-off instruction to the outdoor unit controller;
the outdoor unit controller is used for controlling an outdoor unit and comprises a main control MCU, a drive MCU and an alternating voltage detection module, wherein the main control MCU and the drive MCU can be communicated with each other, the alternating voltage detection module is used for detecting alternating voltage, the main control MCU is directly connected with a first end of a power supply, the drive MCU is connected with a second end of the power supply through a switch, the first end of the alternating voltage detection module is connected with the alternating voltage of the alternating voltage supply, the second end of the alternating voltage detection module is connected between the switch and the second end of the power supply, a third end of the alternating voltage detection module is connected between the main control MCU and the first end of the power supply, and a fourth end of the alternating voltage detection module is connected with the main control MCU, wherein the switch is closed when the main control MCU receives a starting instruction;
the master MCU is configured to include:
when the air conditioner is connected with an alternating current power supply and is not started, receiving a first voltage detection signal sent by the alternating current voltage detection module;
and if the first voltage detection signal exceeds a preset range, outputting a fault signal and refusing to start.
In some embodiments of the present application, the controller is further configured to:
if the first voltage detection signal does not exceed the preset range, keeping a standby state, and closing the switch and starting the air conditioner when receiving a starting instruction sent by the indoor unit controller;
and receiving a second voltage detection signal sent by the alternating voltage detection module, and if the second voltage detection signal exceeds the preset range, disconnecting the switch, stopping the operation of the air conditioner and outputting a fault signal.
In some embodiments of the present application, the controller is further configured to:
and if the second voltage detection signal does not exceed the preset range, keeping the air conditioner running.
In some embodiments of the present application, the switch further comprises an associated switch connected between the power supply and an outdoor unit load, the switch and the associated switch remaining identical when actuated.
In some embodiments of the present application, the ac voltage detection module is embodied as an isolation operational amplifier.
Correspondingly, the invention also provides an alternating voltage detection method, which is applied to an air conditioner comprising a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor unit controller and an outdoor unit controller, wherein the outdoor unit controller is used for controlling an outdoor unit and comprises a main control MCU, a driving MCU and an alternating voltage detection module, the main control MCU and the driving MCU can be communicated with each other, the alternating voltage detection module is used for detecting the alternating voltage, the main control MCU is directly connected with the first end of a power supply, the driving MCU is connected with the second end of the power supply through a switch, the first end of the alternating voltage detection module is connected with the alternating voltage of the alternating power supply, the second end of the alternating voltage detection module is connected between the switch and the second end of the power supply, the third end of the alternating voltage detection module is connected between the main control MCU and the first end of the power supply, the fourth end of the alternating voltage detection module is connected with the main control MCU, wherein the switch is closed when the main control MCU receives a starting instruction, and the method comprises the following steps:
when the air conditioner is connected with an alternating current power supply and is not started, receiving a first voltage detection signal sent by the alternating current voltage detection module;
and if the first voltage detection signal exceeds a preset range, outputting a fault signal and refusing to start.
In some embodiments of the present application, after receiving the first voltage detection signal sent by the ac voltage detection module, the method further includes:
if the first voltage detection signal does not exceed the preset range, keeping a standby state, and closing the switch and starting the air conditioner when receiving a starting instruction sent by the indoor unit controller;
and receiving a second voltage detection signal sent by the alternating voltage detection module, and if the second voltage detection signal exceeds the preset range, disconnecting the switch, stopping the operation of the air conditioner and outputting a fault signal.
In some embodiments of the present application, after receiving the second voltage detection signal sent by the ac voltage detection module, the method further includes:
and if the second voltage detection signal does not exceed the preset range, keeping the air conditioner running.
In some embodiments of the present application, the switch further comprises an associated switch connected between the power supply and an outdoor unit load, the switch and the associated switch remaining identical when actuated.
In some embodiments of the present application, the ac voltage detection module is embodied as an isolation operational amplifier.
By applying the technical scheme, the main control MCU of the air conditioner is configured to receive a first voltage detection signal sent by the alternating voltage detection module when the air conditioner is connected to the alternating current power supply and is not started; if the first voltage detection signal exceeds a preset range, outputting a fault signal and refusing to start the air conditioner, so that the air conditioner can accurately detect the alternating voltage in a standby state, and if the first voltage detection signal does not exceed the preset range, keeping the standby state, and closing the switch and starting the air conditioner when a starting instruction sent by the indoor unit controller is received; and receiving a second voltage detection signal sent by the alternating voltage detection module, and if the second voltage detection signal exceeds the preset range, switching off the switch, stopping the air conditioner from running and outputting a fault signal, so that the air conditioner can accurately detect the alternating voltage in a working state, the alternating voltage detection is perfected under the condition of not influencing the standby power consumption, and the reliability of the outdoor unit controller is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit diagram schematically showing the configuration of an air conditioner according to the embodiment.
Fig. 2 shows a topology diagram of an indoor unit controller and an outdoor unit controller in the prior art.
Fig. 3 shows a topology diagram of an indoor unit controller and an outdoor unit controller according to an embodiment of the present invention.
Fig. 4 shows a schematic diagram of the ac voltage detection process in the embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating an ac voltage detection process according to another embodiment of the present invention.
Description of the reference symbols
1: an air conditioner; 2: an outdoor unit; 3: an indoor unit; 10: a refrigerant circuit; 11: a compressor; 12: a four-way valve; 13: an outdoor heat exchanger;
14: an expansion valve; 16: an indoor heat exchanger; 21: an outdoor fan; 31: an indoor fan; 32: an indoor temperature sensor; 33: an indoor heat exchanger temperature sensor;
63: a vertical baffle; 64, 65: horizontal baffle
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
Fig. 1 shows a circuit configuration of an air conditioner 1, and the air conditioner 1 includes a refrigerant circuit 10, and is capable of executing a vapor compression refrigeration cycle by circulating a refrigerant in the refrigerant circuit 10. The indoor unit 3 and the outdoor unit 2 are connected by a connecting pipe 4 to form a refrigerant circuit 10 in which a refrigerant circulates. The refrigerant circuit 10 includes a compressor 11, an outdoor heat exchanger 13, an expansion valve 14, an accumulator 15, and an indoor heat exchanger 16. Among them, the indoor heat exchanger 16 and the outdoor heat exchanger 13 operate as a condenser or an evaporator. The compressor 11 sucks the refrigerant from the suction port, and discharges the refrigerant compressed therein to the indoor heat exchanger 16 from the discharge port. The compressor 11 is an inverter compressor with variable capacity that performs rotational speed control by an inverter, and the four-way valve 12 switches between heating and cooling.
The outdoor heat exchanger 13 has a first inlet and a second outlet for allowing the refrigerant to flow between the refrigerant and the suction port of the compressor 11 through the accumulator 15, and the refrigerant flows between the refrigerant and the expansion valve 14. The outdoor heat exchanger 13 exchanges heat between the outdoor air and the refrigerant flowing through a heat transfer pipe (not shown) connected between the second inlet and the first inlet of the outdoor heat exchanger 13.
The expansion valve 14 is disposed between the outdoor heat exchanger 13 and the indoor heat exchanger 16. The expansion valve 14 has a function of expanding and decompressing the refrigerant flowing between the outdoor heat exchanger 13 and the indoor heat exchanger 16. The expansion valve 14 is configured to be capable of changing the opening degree, and by decreasing the opening degree, the flow path resistance of the refrigerant passing through the expansion valve 14 is increased, and by increasing the opening degree, the flow path resistance of the refrigerant passing through the expansion valve 14 is decreased. The expansion valve 14 expands and decompresses the refrigerant flowing from the indoor heat exchanger 16 to the outdoor heat exchanger 13 during the heating operation. Further, even if the states of other devices installed in the refrigerant circuit 10 do not change, when the opening degree of the expansion valve 14 changes, the flow rate of the refrigerant flowing in the refrigerant circuit 10 changes.
The indoor heat exchanger 16 has a second inlet and outlet for allowing the liquid refrigerant to flow between the expansion valve 14 and the indoor heat exchanger, and has a first inlet and outlet for allowing the gas refrigerant to flow between the compressor 11 and the discharge port. The indoor heat exchanger 16 exchanges heat between the refrigerant flowing through the heat transfer pipe connected between the second inlet and the first inlet and the second outlet of the indoor heat exchanger 16 and the indoor air.
An accumulator 15 is disposed between the outdoor heat exchanger 13 and the suction port of the compressor 11. In the accumulator 15, the refrigerant flowing from the outdoor heat exchanger 13 to the compressor 11 is separated into a gas refrigerant and a liquid refrigerant. Then, the gas refrigerant is mainly supplied from the accumulator 15 to the suction port of the compressor 11.
The outdoor unit 2 further includes an outdoor fan 21, and the outdoor fan 21 generates an airflow of outdoor air passing through the outdoor heat exchanger 13 to promote heat exchange between the refrigerant flowing through the heat transfer tubes and the outdoor air. The outdoor fan 21 is driven by an outdoor fan motor 21A capable of changing the rotation speed. The indoor unit 3 further includes an indoor fan 31, and the indoor fan 31 generates an airflow of the indoor air passing through the indoor heat exchanger 16 to promote heat exchange between the refrigerant flowing through the heat transfer tubes and the indoor air. The indoor fan 31 is driven by an indoor fan motor 31A whose rotation speed can be changed.
As shown in fig. 2, in the prior art, the indoor unit controller and the outdoor unit controller can communicate with each other, and the on/off command is received by the indoor unit controller and then sent to the outdoor unit controller. The main control MCU and the driving MCU of the outdoor unit controller are designed to be power isolation (a circuit on one side of the main control MCU and a circuit on one side of the driving MCU supply power respectively). In order to reduce the standby power consumption of the air conditioner, for the outdoor unit controller, the driving MCU side circuit power supply is disconnected by controlling the K1 and K2 switches in the standby state, and the main control MCU side circuit power supply is connected at all times. Due to the requirements of power supply and safety design, the alternating voltage detection part needs to be completed by the driving MCU, and then the main control MCU is informed through communication. When the outdoor unit controller receives a starting-up instruction, the K1 and the K2 are attracted, and the driving MCU can communicate the alternating voltage detection result to the main control MCU. Although the control scheme can achieve low standby power consumption, the alternating-current voltage condition cannot be identified in the standby state, if abnormal conditions (such as too high voltage) occur, the outdoor unit controller may be damaged, the product cannot be used, and user experience is affected.
In order to solve the above problem, an embodiment of the present invention provides an air conditioner, as shown in fig. 3, an outdoor unit controller includes a main control MCU and a driving MCU, which can communicate with each other, and an ac voltage detection module for detecting an ac voltage, where the main control MCU is directly connected to a first end of a power supply, the driving MCU is connected to a second end of the power supply through a switch K2, the first end of the ac voltage detection module is connected to the ac voltage of the ac power supply, a second end of the ac voltage detection module is connected between a switch K2 and the second end of the power supply, a third end of the ac voltage detection module is connected between the main control MCU and the first end of the power supply, and a fourth end of the ac voltage detection module is connected to the main control MCU, where the switch K2 is closed when the main control MCU receives a power-on command, the K2 further includes an associated switch K1, the associated switch K1 is connected between the power supply and the outdoor unit load (PFC + motor), and K1 and K2 are consistent when in action.
The alternating voltage detection module can be an isolation operational amplifier, and a power supply on the driving MCU side and a power supply on the main control MCU side are respectively provided for the isolation operational amplifier, so that the detection of the alternating voltage is realized. The alternating voltage is detected on one side of the driving MCU, then isolated transmission of signals is realized in the amplifier, and the signals are sent to the main control MCU, and the detection of the voltage on the strong current side by the MCU on the weak current side is realized on the controller isolated by the strong current and the weak current.
As shown in fig. 4, the process of detecting the ac voltage by the main control MCU includes:
1) if the alternating voltage is abnormal, outputting a fault signal and refusing to start up the computer if the alternating voltage is abnormal; otherwise, the standby is kept.
When the whole machine is powered on and is not started, a first voltage detection signal sent by the alternating voltage detection module is received.
If the first voltage detection signal exceeds a preset range, the alternating voltage is abnormal, a fault signal is output, and starting is refused;
if the first voltage detection signal does not exceed the preset range, the alternating current voltage is normal and the standby state is kept.
2) And (4) judging whether a starting-up instruction is received, if so, attracting K1 and K2, and otherwise, keeping the standby state.
And the starting-up instruction is sent by the indoor unit controller, and if the starting-up instruction is received, closing and attracting K1 and K2 and starting the air conditioner.
3) If the alternating voltage is abnormal, disconnecting K1 and K2, stopping the operation of the air conditioner and outputting a fault signal; otherwise, the air conditioner is kept running.
And receiving a second voltage detection signal sent by the alternating voltage detection module.
And if the second voltage detection signal exceeds the preset range, determining that the alternating current voltage is abnormal, disconnecting K1 and K2, stopping the operation of the air conditioner and outputting a fault signal.
And if the second voltage detection signal does not exceed the preset range, determining that the alternating voltage is normal, keeping the air conditioner running, and continuously detecting the alternating voltage.
By applying the technical scheme, the main control MCU of the air conditioner is configured to receive a first voltage detection signal sent by the alternating voltage detection module when the air conditioner is connected to the alternating current power supply and is not started; if the first voltage detection signal exceeds a preset range, outputting a fault signal and refusing to start the air conditioner, so that the air conditioner can accurately detect the alternating voltage in a standby state, and if the first voltage detection signal does not exceed the preset range, keeping the standby state, and closing the switch and starting the air conditioner when a starting instruction sent by the indoor unit controller is received; and receiving a second voltage detection signal sent by the alternating voltage detection module, and if the second voltage detection signal exceeds the preset range, disconnecting the switch, stopping the air conditioner from running and outputting a fault signal, so that the alternating voltage can be accurately detected by the air conditioner in a working state, and the reliability of the outdoor unit controller is improved.
Corresponding to the air conditioner in the embodiment of the application, the embodiment of the application also provides an alternating voltage detection method, the method is applied to the air conditioner comprising a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor unit controller and an outdoor unit controller, the outdoor unit controller is used for controlling an outdoor unit and comprises a main control MCU and a driving MCU which can be communicated with each other, and an alternating voltage detection module used for detecting the alternating voltage, the main control MCU is directly connected with a first end of a power supply, the driving MCU is connected with a second end of the power supply through a switch, the first end of the alternating voltage detection module is connected with the alternating voltage of the alternating current power supply, a second end of the alternating voltage detection module is connected between the switch and the second end of the power supply, a third end of the alternating voltage detection module is connected between the main control MCU and the first end of the power supply, a fourth end of the alternating voltage detection module is connected to the main control MCU, wherein the switch is closed when the main control MCU receives a power-on command, as shown in fig. 5, the method includes:
step S201, when the air conditioner is connected to the ac power source and is not turned on, receives a first voltage detection signal sent by the ac voltage detection module.
In this step, when the air conditioner is powered on and connected to the ac power supply, and the main control MCU does not receive the power-on instruction sent by the indoor unit controller, the ac voltage detection module detects the ac power supply, and sends a detected first voltage detection signal to the main control MCU.
In order to accurately and reliably detect the ac voltage, in a preferred embodiment of the present application, the ac voltage detection module is specifically an isolation operational amplifier, the isolation operational amplifier is a special measurement amplifying circuit, there is no direct circuit coupling between the input and output of the isolation operational amplifier and the power circuit, and there is no common ground terminal in the transmission process of the signal, as shown in fig. 3, the isolation operational amplifier is on the side of the driving MCU, detects the ac voltage, then implements isolation transmission of the signal inside the amplifier, and sends the signal to the main control MCU.
It should be noted that, those skilled in the art may select other types of ac voltage detection modules according to practical situations, which does not affect the scope of the present application.
Step S202, if the first voltage detection signal exceeds a preset range, outputting a fault signal and refusing to start the computer.
Specifically, if the first voltage detection signal exceeds a preset range, the alternating current voltage is abnormal, a fault signal is output, and the starting is rejected.
In order to reliably detect the ac voltage in the operating state of the air conditioner, in a preferred embodiment of the present application, after receiving the first voltage detection signal sent by the ac voltage detection module, the method further includes:
if the first voltage detection signal does not exceed the preset range, keeping a standby state, and closing the switch and starting the air conditioner when receiving a starting instruction sent by the indoor unit controller;
and receiving a second voltage detection signal sent by the alternating voltage detection module, and if the second voltage detection signal exceeds the preset range, disconnecting the switch, stopping the operation of the air conditioner and outputting a fault signal.
Specifically, if the first voltage detection signal does not exceed the preset range, it indicates that the ac voltage is normal, and the standby state is maintained.
And if a starting-up instruction sent by the indoor unit controller is received, closing the switch and starting the air conditioner. At the moment, the alternating voltage detection module continues to detect the alternating voltage and sends a detected second voltage detection signal to the main control MCU, if the second voltage detection signal exceeds the preset range, the power supply voltage is abnormal at the moment, the switch is switched off, the air conditioner is stopped to operate, and a fault signal is output.
In order to reliably control the air conditioner, in a preferred embodiment of the present invention, the switch further includes an associated switch connected between the power supply and the outdoor unit load, and the switch and the associated switch are kept in agreement when they are operated.
Specifically, in a specific application scenario of the present application, as shown in fig. 3, the switch K2 further includes a related switch K1, the related switch K1 is connected between the power supply and the outdoor unit load (PFC + motor), and K1 and K2 are consistent during operation.
In order to normally operate the air conditioner when the ac voltage is normal, in a preferred embodiment of the present application, after receiving the second voltage detection signal sent by the ac voltage detection module, the method further includes:
and if the second voltage detection signal does not exceed the preset range, keeping the air conditioner running.
Specifically, if the second voltage detection signal does not exceed the preset range, it indicates that the ac voltage is normal, the air conditioner is kept running, and the ac voltage is continuously detected.
By applying the technical scheme, in the air conditioner comprising a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor unit controller and an outdoor unit controller, when the air conditioner is connected to an alternating current power supply and is not started, a first voltage detection signal sent by an alternating current voltage detection module is received; if the first voltage detection signal exceeds a preset range, outputting a fault signal and refusing to start the air conditioner, so that the air conditioner can accurately detect the alternating voltage in a standby state, and if the first voltage detection signal does not exceed the preset range, keeping the standby state, and closing the switch and starting the air conditioner when a starting instruction sent by the indoor unit controller is received; and receiving a second voltage detection signal sent by the alternating voltage detection module, and if the second voltage detection signal exceeds the preset range, disconnecting the switch, stopping the air conditioner from running and outputting a fault signal, so that the alternating voltage can be accurately detected by the air conditioner in a working state, and the reliability of the outdoor unit controller is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. An air conditioner, characterized in that the air conditioner comprises:
the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the heat exchangers operates as a condenser and the other operates as an evaporator;
the indoor unit controller is used for controlling the indoor unit and sending the on-off instruction to the outdoor unit controller;
the outdoor unit controller is used for controlling an outdoor unit and comprises a main control MCU, a drive MCU and an alternating voltage detection module, wherein the main control MCU and the drive MCU can be communicated with each other, the alternating voltage detection module is used for detecting alternating voltage, the main control MCU is directly connected with a first end of a power supply, the drive MCU is connected with a second end of the power supply through a switch, the first end of the alternating voltage detection module is connected with the alternating voltage of the alternating voltage supply, the second end of the alternating voltage detection module is connected between the switch and the second end of the power supply, a third end of the alternating voltage detection module is connected between the main control MCU and the first end of the power supply, and a fourth end of the alternating voltage detection module is connected with the main control MCU, wherein the switch is closed when the main control MCU receives a starting instruction;
the master MCU is configured to include:
when the air conditioner is connected with an alternating current power supply and is not started, receiving a first voltage detection signal sent by the alternating current voltage detection module;
and if the first voltage detection signal exceeds a preset range, outputting a fault signal and refusing to start.
2. The air conditioner of claim 1, wherein the controller is further configured to:
if the first voltage detection signal does not exceed the preset range, keeping a standby state, and closing the switch and starting the air conditioner when receiving a starting instruction sent by the indoor unit controller;
and receiving a second voltage detection signal sent by the alternating voltage detection module, and if the second voltage detection signal exceeds the preset range, disconnecting the switch, stopping the operation of the air conditioner and outputting a fault signal.
3. The air conditioner of claim 2, wherein the controller is further configured to:
and if the second voltage detection signal does not exceed the preset range, keeping the air conditioner running.
4. The air conditioner of claim 1, further comprising an associated switch, said associated switch being connected between said power supply and an outdoor unit load, said switch and said associated switch being in unison when actuated.
5. The air conditioner according to claim 1, wherein the ac voltage detection module is embodied as an isolated operational amplifier.
6. An alternating current voltage detection method is characterized in that the method is applied to an air conditioner comprising a refrigerant circulation loop, a compressor, an outdoor heat exchanger, an indoor unit controller and an outdoor unit controller, wherein the outdoor unit controller is used for controlling an outdoor unit and comprises a main control MCU, a driving MCU and an alternating current voltage detection module, the main control MCU and the driving MCU can be communicated with each other, the alternating current voltage detection module is used for detecting alternating current voltage, the main control MCU is directly connected with a first end of a power supply, the driving MCU is connected with a second end of the power supply through a switch, the first end of the alternating current voltage detection module is connected with alternating current voltage of the alternating current power supply, the second end of the alternating current voltage detection module is connected between the switch and the second end of the power supply, the third end of the alternating current voltage detection module is connected between the main control MCU and the first end of the power supply, the fourth end of the alternating voltage detection module is connected with the main control MCU, wherein the switch is closed when the main control MCU receives a starting instruction, and the method comprises the following steps:
when the air conditioner is connected with an alternating current power supply and is not started, receiving a first voltage detection signal sent by the alternating current voltage detection module;
and if the first voltage detection signal exceeds a preset range, outputting a fault signal and refusing to start.
7. The method of claim 6, wherein after receiving the first voltage detection signal transmitted by the AC voltage detection module, the method further comprises:
if the first voltage detection signal does not exceed the preset range, keeping a standby state, and closing the switch and starting the air conditioner when receiving a starting instruction sent by the indoor unit controller;
and receiving a second voltage detection signal sent by the alternating voltage detection module, and if the second voltage detection signal exceeds the preset range, disconnecting the switch, stopping the operation of the air conditioner and outputting a fault signal.
8. The method of claim 7, wherein after receiving the second voltage detection signal sent by the ac voltage detection module, the method further comprises:
and if the second voltage detection signal does not exceed the preset range, keeping the air conditioner running.
9. The method of claim 6, further comprising an associated switch, the associated switch connected between the power supply and an outdoor unit load, the switch and the associated switch remaining identical when actuated.
10. The method of claim 6, wherein the AC voltage detection module is embodied as an isolated operational amplifier.
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