Air conditioner

Abstract

The invention provides an air conditioner which comprises a controller, and the controller is configured to determine a first temperature value corresponding to a first thermistor according to a first voltage value and a second voltage value; determining an outdoor environment temperature value based on the first temperature value; determining a pipeline temperature value of an outdoor heat exchanger and / or an exhaust temperature value of a compressor based on the outdoor environment temperature value; and the compressor and / or the outdoor fan are / is controlled to operate according to at least one of the three temperature values. When the air conditioner runs, the two voltage values corresponding to the three thermistors can be read through the two sampling ports, the outdoor environment temperature value, the pipeline temperature value of the outdoor heat exchanger and the exhaust temperature value of the compressor are obtained according to the two voltage values, and the compressor and / or the fan are / is controlled to run according to the obtained temperature values. The effect that three temperature values are calculated through two sampling ports is achieved, the circuit structure is simplified, control chip resources are saved, occupied space is reduced, and meanwhile circuit power consumption is further reduced.

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] When controlling parameters such as the operating frequency of the compressor and the rotational speed of the fan in the existing variable-frequency air conditioner outdoor unit, it is necessary to simultaneously collect the outdoor ambient temperature, the pipeline temperature of the outdoor heat exchanger, and the exhaust temperature of the outdoor compressor. In the prior art, usually three NTC (Negative Temperature Coefficient) thermistors are connected to three sampling ports of the control chip, the voltage values at both ends of the three thermistors are detected, and then converted into corresponding temperature values for acquisition.

[0003] However, with the intensification of industry competition and the reduction of the cost of control chips, the number of available signal sampling ports of the control chip is continuously decreasing, and at the same time, the circuit board size is also shrinking, requiring the components on the circuit board to be continuously streamlined. Therefore, the traditional multi-port temperature detection method has become inapplicable, and there is an urgent need for a more streamlined and optimized design scheme to adapt to the new market demands and technological trends. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, an object of the present invention is to provide an air conditioner. Through circuit optimization, when the air conditioner is operating, two voltage values corresponding to three thermistors can be read and detected through two sampling ports, and the outdoor ambient temperature value, the pipeline temperature value of the outdoor heat exchanger, and the exhaust temperature value of the compressor can be calculated based on the two voltage values, so as to control the operation of the compressor and / or the outdoor fan according to the obtained temperature values, achieving the effect of calculating three temperature values with two sampling ports, while simplifying the circuit structure, saving control chip resources, reducing the occupied space, and further reducing the circuit power consumption.

[0006] To this end, a second object of the present invention is to provide a control method for an air conditioner.

[0007] To achieve the above object, an embodiment of the first aspect of the present invention provides an air conditioner, which includes: a refrigerant circulation circuit that enables the refrigerant to perform a refrigeration cycle in a circuit composed of a compressor, a condenser, an expansion valve, an evaporator, and a four-way valve, where one of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; An outdoor fan for driving outdoor air to pass through the outdoor heat exchanger by rotation, so that the refrigerant exchanges heat with the outdoor air; Temperature detection circuit, the temperature detection circuit comprising: a power supply module for powering the controller; the controller, the controller including a first sampling port and a second sampling port; a first thermistor, a second thermistor, and a third thermistor connected in series; Wherein, the first thermistor is disposed in the outdoor environment, and its resistance value changes according to the outdoor ambient temperature value, and the temperature converted from the resistance value of the first thermistor represents the outdoor ambient temperature; The second thermistor is disposed in the pipeline of the outdoor heat exchanger, and its resistance value changes according to the pipeline temperature value of the outdoor heat exchanger, and the temperature converted from the resistance value of the second thermistor represents the pipeline temperature value of the outdoor heat exchanger; The third thermistor is disposed at the exhaust port of the compressor, and its resistance value changes according to the exhaust temperature value of the compressor, and the temperature converted from the resistance value of the third thermistor represents the exhaust temperature value of the compressor; Wherein, the first sampling port is connected to a first sampling point between the first thermistor and the second thermistor for collecting a first voltage value at the first sampling point, and the second sampling port is connected to a second sampling point between the second thermistor and the third thermistor for collecting a second voltage value at the second sampling point; The controller is configured to: obtain the first voltage value and the second voltage value; Determine a first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value; Determine the outdoor ambient temperature value based on the first temperature value; Determine the pipeline temperature value of the outdoor heat exchanger and / or the exhaust temperature value of the compressor based on the outdoor ambient temperature value; Control the operation of the compressor and / or the outdoor fan according to at least one of the outdoor ambient temperature value, the pipeline temperature value of the outdoor heat exchanger, and the exhaust temperature value of the compressor.

[0008] According to the air conditioner of the embodiment of the present invention, through circuit optimization, when the air conditioner is running, two voltage values related to three thermistors can be read through two sampling ports, and the outdoor ambient temperature value, the pipeline temperature value of the outdoor heat exchanger, and the exhaust temperature value of the compressor can be calculated according to the two voltage values, so as to control the operation of the compressor and / or the outdoor fan according to the obtained temperature values, achieving the effect of calculating three temperature values with two sampling ports, while simplifying the circuit structure, saving control chip resources, reducing the occupied space, and further reducing the circuit power consumption.

[0009] In some embodiments, when determining the first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value, the controller is configured to: traverse the first preset table stored in the controller; if the first voltage value and the second voltage value are found in the first preset table, obtain the first temperature value corresponding to the first voltage value and the second voltage value, wherein multiple groups of corresponding relationships of first voltage value - second voltage value - first temperature value are stored in the first preset table; when determining the outdoor ambient temperature based on the first temperature value, the controller is configured to: use the first temperature value as the outdoor ambient temperature value.

[0010] The above technical solution has the following beneficial effects: By compiling and storing the first preset table through experimental data or actual measurement results, the accuracy and reliability of the data can be ensured, thereby improving the reliability of the air conditioner. At the same time, through the pre-stored first preset table, the controller can directly find the first temperature value corresponding to the first voltage value and the second voltage value, and use the first temperature value as the outdoor ambient temperature value, avoiding complex calculation errors.

[0011] In some embodiments, when determining the first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value, the controller is configured to: traverse the first preset table stored in the controller; if the first voltage value and the second voltage value are not found in the first preset table, control the outdoor fan to operate until the first preset time is reached, and then traverse the first preset table again; if the first voltage value and the second voltage value are found in the first preset table again, obtain the first temperature value corresponding to the first voltage value and the second voltage value, wherein multiple groups of corresponding relationships of first voltage value - second voltage value - first temperature value are stored in the first preset table; if the first voltage value and the second voltage value are not found in the first preset table again, output a fault message and control the outdoor fan to stop operating.

[0012] The above technical solution has the following beneficial effects: In the case where a matching voltage value combination is not found in the preset table, the controller can control the outdoor fan to operate to promote heat exchange between temperature detection points, improve the reliability of temperature detection, and achieve the effect of detecting three temperatures with two voltage values. Further, if a matching voltage value combination is still not found within the preset time, the controller can immediately trigger a fault report to prompt the user or maintenance personnel to check, enhancing the fault diagnosis ability of the air conditioner, and thus improving the reliability of the air conditioner.

[0013] In some embodiments, after determining the outdoor ambient temperature value based on the first temperature value, the controller is further configured to: obtain the current first voltage value at the first sampling point; query a second preset table pre-stored in the controller according to the outdoor ambient temperature value to obtain the resistance value of the first thermistor corresponding to the outdoor ambient temperature value, wherein multiple sets of corresponding relationships between the resistance value of the first thermistor and the outdoor ambient temperature value are pre-stored in the second preset table; and determine the current passing through the first thermistor according to the resistance value of the first thermistor and the current first voltage value.

[0014] The above technical solution has the following beneficial effects: By compiling and pre-storing the second preset table based on experimental data or actual measurement results, the accuracy and reliability of the data can be ensured, thereby improving the reliability of the air conditioner. At the same time, through the pre-stored second preset table, the controller can directly find the corresponding relationship between the resistance value of the first thermistor and the outdoor ambient temperature value to obtain the resistance value of the first thermistor, avoiding complex calculation errors. At the same time, it is also convenient to determine the current passing through the first thermistor according to the resistance value of the first thermistor and the current first voltage value.

[0015] In some embodiments, after determining the current passing through the first thermistor according to the resistance value of the first thermistor, the controller is further configured to: obtain the current second voltage value at the second sampling point; determine the resistance value of the second thermistor according to the current, the current first voltage value, and the current second voltage value; determine the second temperature value corresponding to the second thermistor based on the resistance value of the second thermistor; and determine the pipeline temperature value of the outdoor heat exchanger based on the second temperature value.

[0016] The above technical solution has the following beneficial effects: After determining the current passing through the first thermistor, since the first thermistor and the second thermistor are in series, the resistance value of the second thermistor can be obtained through Ohm's law, and then the pipeline temperature value of the outdoor heat exchanger can be determined based on the resistance value of the second thermistor, thereby improving the accuracy and reliability of temperature detection and simplifying the calculation process.

[0017] In some embodiments, when determining the second temperature value corresponding to the second thermistor based on the resistance value of the second thermistor, the controller is configured to: query a third preset table pre-stored in the controller according to the resistance value of the second thermistor to obtain the second temperature value corresponding to the second thermistor, wherein multiple sets of corresponding relationships between the resistance value of the second thermistor and the second temperature value are pre-stored in the third preset table; when determining the pipeline temperature value of the outdoor heat exchanger based on the second temperature value, the controller is configured to: use the second temperature value as the pipeline temperature value of the outdoor heat exchanger.

[0018] The above technical solution has the following beneficial effects: By compiling and pre-storing the third preset table based on experimental data or actual measurement results, the accuracy and reliability of the data can be ensured, thereby improving the reliability of the air conditioner. At the same time, through the pre-stored third preset table, the controller can directly find the corresponding relationship between the resistance value of the second thermistor and the second temperature value, obtain the second temperature value, and use the second temperature value as the pipeline temperature value of the outdoor heat exchanger, avoiding complex calculation errors.

[0019] In some embodiments, after determining the current passing through the first thermistor according to the resistance value of the first thermistor, the controller is further configured to: determine the resistance value of the third thermistor according to the current and the current second voltage value; determine the third temperature value corresponding to the third thermistor based on the resistance value of the third thermistor; and obtain the exhaust temperature value of the compressor based on the third temperature value.

[0020] The above technical solution has the following beneficial effects: After determining the current passing through the first thermistor, since the first thermistor is in series with the second thermistor and the third thermistor, the resistance value of the third thermistor can be obtained through Ohm's law, and then the exhaust temperature of the compressor can be determined based on the resistance value of the third thermistor, thereby improving the accuracy and reliability of temperature detection and simplifying the calculation process.

[0021] In some embodiments, when determining the third temperature value corresponding to the third thermistor based on the resistance value of the third thermistor, the controller is further configured to: query the fourth preset table pre-stored in the controller according to the resistance value of the third thermistor to obtain the third temperature value corresponding to the third thermistor, where multiple groups of corresponding relationships between the resistance value of the third thermistor and the third temperature value are pre-stored in the fourth preset table; when obtaining the exhaust temperature value of the compressor based on the third temperature value, the controller is configured to: use the third temperature value as the exhaust temperature value of the compressor.

[0022] The above technical solution has the following beneficial effects: By compiling and pre-storing the fourth preset table based on experimental data or actual measurement results, the accuracy and reliability of the data can be ensured, thereby improving the reliability of the air conditioner. At the same time, through the pre-stored fourth preset table, the controller can directly find the corresponding relationship between the resistance value of the third thermistor and the third temperature value, obtain the third temperature value, and use the third temperature value as the exhaust temperature value of the compressor, avoiding complex calculation errors.

[0023] In some embodiments, before obtaining the first voltage value and the second voltage value, the controller is further configured to: determine whether the air conditioner meets a preset condition, where the preset condition includes: the air conditioner is powered on for the first time, or when the operating time of the air conditioner does not exceed a second preset time, the time when the compressor stops running and is in a standby state reaches a third preset time, where the second preset time is greater than the third preset time; if so, obtain the first voltage value at the first sampling point and the second voltage value at the second sampling point, otherwise, do not obtain the first voltage value at the first sampling point and the second voltage value at the second sampling point.

[0024] The above technical solution has the following beneficial effects: By judging the preset conditions before obtaining the first voltage value and the second voltage value, it can be determined that the air conditioner is currently in a stable state, that is, the heat exchange is at an equilibrium point at this time, which can facilitate the controller to perform temperature detection efficiently and accurately, reduce unnecessary calculations and energy consumption, and achieve the effect of detecting three temperatures at two sampling ports.

[0025] In some embodiments, the power supply module includes: a voltage conversion module for converting the input alternating current into direct current suitable for powering the controller, so as to power the controller.

[0026] The above technical solution has the following beneficial effects: By setting the voltage conversion module, the AC power supply with different voltage levels can be converted into direct current suitable for the controller, ensuring the stable operation of the controller, protecting the controller from damage, and enhancing the compatibility and flexibility of the air conditioner.

[0027] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0028] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where: Figure 1 is a schematic diagram of the refrigeration cycle system of an air conditioner according to an embodiment of the present invention; Figure 2 is a schematic diagram of the structure of an air conditioner according to an embodiment of the present invention; Figure 3 is a schematic diagram of the structure of a controller according to an embodiment of the present invention; Figure 4 is a schematic diagram of the structure of an air conditioner according to another embodiment of the present invention; Figure 5 is a schematic diagram of the structure of a temperature detection circuit according to an embodiment of the present invention; Figure 6 is a flowchart of a control method for an air conditioner according to an embodiment of the present invention; Figure 7 is a flowchart of determining a first temperature value corresponding to a first thermistor according to a first voltage value and a second voltage value according to an embodiment of the present invention; Figure 8 is a schematic flowchart of determining a current passing through a first thermistor according to an embodiment of the present invention; Figure 9 is a schematic flowchart of determining a pipeline temperature value of an outdoor heat exchanger according to an embodiment of the present invention; Figure 10 is a schematic flowchart of determining an exhaust temperature value of a compressor according to an embodiment of the present invention. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 thus cannot be understood as a limitation to the present invention.

[0031] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] As Figure 1 shown, in the present invention, the air conditioner 1 performs a refrigeration cycle by using a compressor, a condenser, an evaporator, and a four-way valve. The refrigeration cycle includes a series of processes involving compression, condensation, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0034] The compressor compresses the refrigerant gas in a high-temperature and high-pressure state entering from the suction pipe and discharges the compressed refrigerant gas through the discharge pipe. The discharged refrigerant gas flows into the condenser from the condenser inlet pipe. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0035] 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 using the latent heat of evaporation of the refrigerant to perform heat exchange with the material to be cooled. Throughout the cycle, the air conditioner 1 can adjust the temperature of the indoor space.

[0036] Combined Figure 2 and Figure 4 shown, the air conditioner 1 in the present application includes an indoor fan 11 and an outdoor fan 12. The indoor fan 11 and the outdoor fan 12 can be set as an integrated machine or a split machine. The indoor fan 11 can be set as a wall-mounted type, a ceiling type, a duct type, etc., and the indoor fan 11 is installed on the top or ceiling of the indoor room.

[0037] Taking the indoor wall-mounted unit as an example, the indoor wall-mounted unit is usually installed at positions such as the indoor wall surface. Again, for example, the indoor cabinet unit (not shown in the figure) is also a form of the indoor fan 11 of the indoor fan 11.

[0038] Taking the split machine as an example, the air conditioner 1 includes an indoor fan 11 and an outdoor fan 12. Among them, the outdoor fan 12 is usually set outdoors and is used for heat exchange with the indoor environment.

[0039] In addition, the air conditioner 1 is provided with a controller 71 to control the operation of various components inside the air conditioner 1, so that the operation of each component of the air conditioner 1 realizes each predetermined function of the air conditioner 1. Among them, a control device 200 is also attached to the air conditioner 1. Exemplarily, the control device 200 is specifically set as a remote controller, which has a function of communicating with the controller 71 using, for example, infrared rays or other communication methods. The remote controller is used for the user to perform various controls on the air conditioner 1, realizing the interaction between the user and the air conditioner 1.

[0040] In the embodiment of the present application, the indoor fan 11 of the air conditioner 1 is arranged at the top or upper part of the room. Generally speaking, the installation height of the indoor fan 11 is higher than the user activity area. The indoor fan 11 includes an air return port 17 and an air outlet 16 communicating with the room. The indoor air passes through the air return port 17 into the indoor fan 11 and then flows back into the room through the air outlet 16.

[0041] At the position of the air outlet 16, a wind deflector 2 is provided. The wind deflector 2 adjusts the outflow direction of the air flowing through the air outlet 12 by changing its relative rotation angle with respect to the air outlet 16, thereby affecting the air temperature stratification in the room.

[0042] The embodiment of the present application also provides a schematic diagram of the hardware structure of a controller 71, as Figure 3 shown. The controller 71 includes a processor 83. Optionally, it further includes a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82, and the communication interface 84 are connected through a bus 81.

[0043] The processor 83 can be a central processing unit 83 (CPU), a general-purpose processor 83, a network processor 83 (NP), a digital signal processor 83 (DSP), a microprocessor 83, a microcontroller 83, a programmable logic device (PLD), or any combination thereof. The processor 83 can also be any other device with processing functions, such as a circuit, a device, or a software module. The processor 83 can also include multiple CPUs, and the processor 83 can be a single-core (single-CPU) processor 83 or a multi-core (multi-CPU) processor 83. Here, the processor 83 can refer to one or more devices, circuits, or processing cores for processing data (such as computer programs).

[0044] The memory 82 can be a read-only memory (ROM), or other types of static storage devices that can store static information, a random access memory (RAM), or other types of dynamic storage devices that can store information. It can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer. The embodiments of the present application do not impose any restrictions on this. The memory 82 can exist independently or be integrated with the processor 83. Among them, the memory 82 can contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby implementing the control method of the air conditioner 1 provided by the embodiments of the present application.

[0045] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface 84 can be a module, a circuit, a transceiver, or any device capable of implementing communication.

[0046] The bus 81 can be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81, etc. The bus 81 can be divided into an address bus 81, a data bus 81, a control bus 81, etc.

[0047] The following Figures 4 - 10 describes the air conditioner 1 and its control method according to the embodiments of the present invention.

[0048] In some embodiments, as Figure 4 shown, the air conditioner 1 includes: a refrigerant circulation circuit 10. The refrigerant circulation circuit enables the refrigerant to perform a refrigeration cycle in a circuit composed of a compressor, a condenser, an expansion valve, and an evaporator. One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger.

[0049] In some embodiments, as Figure 4 shown, the air conditioner 1 may include: an outdoor fan 12 for driving outdoor air to pass through the outdoor heat exchanger by rotation, so that the refrigerant exchanges heat with the outdoor air.

[0050] In some embodiments, in combination with Figure 4 and Figure 5 shown, the air conditioner 1 may include: a temperature detection circuit 13, and the temperature detection circuit 13 includes: a power supply module for supplying power to the controller 71; the controller 71, and the controller 71 includes a first sampling port and a second sampling port; a first thermistor, a second thermistor and a third thermistor connected in series; wherein, the first thermistor is arranged in the outdoor environment, and its resistance value changes according to the outdoor ambient temperature, and the temperature converted by the resistance value of the first thermistor represents the outdoor ambient temperature; the second thermistor is arranged in the pipeline of the outdoor heat exchanger, and its resistance value changes according to the pipeline temperature value of the outdoor heat exchanger, and the temperature converted by the resistance value of the second thermistor represents the pipeline temperature value of the outdoor heat exchanger; the third thermistor is arranged at the exhaust port of the compressor, and its resistance value changes according to the exhaust temperature value of the compressor, and the temperature converted by the resistance value of the third thermistor represents the exhaust temperature value of the compressor; wherein, the first sampling port is connected to the first sampling point between the first thermistor and the second thermistor for collecting the first voltage value at the first sampling point, and the second sampling port is connected to the second sampling point between the second thermistor and the third thermistor for collecting the second voltage value at the second sampling point.

[0051] Specifically, in the air conditioner 1, a temperature detection circuit 13 is provided for detecting various temperature parameters during the operation of the air conditioner 1, including but not limited to the outdoor ambient temperature, the pipeline temperature of the outdoor heat exchanger, and the exhaust temperature of the compressor, etc. Specifically, as Figure 5 shown, the temperature detection circuit 13 includes: a power supply module connected to the controller 71, the controller 71 with a first sampling port and a second sampling port, and a first thermistor, a second thermistor and a third thermistor connected in series. Among them, the power supply module can provide a stable power output for the controller 71 to ensure the stable operation of the controller 71; the first sampling port of the controller 71 is connected to the first sampling point between the first thermistor and the second thermistor, and can collect the first voltage value at the first sampling point, and the second sampling port of the controller 71 is connected to the second sampling point between the second thermistor and the third thermistor, and can collect the second voltage value at the second sampling point.

[0052] Further, as Figure 5As shown, the first end of the first thermistor is grounded, the second end is connected to the first end of the second thermistor, the second end of the second thermistor is connected to the first end of the third thermistor, and the second end of the third thermistor is connected to a power supply with a specific voltage (such as a 5V power supply). Among them, the first thermistor, the second thermistor, and the third thermistor can all be negative temperature coefficient thermistors, and their important temperature characteristic is that the higher the temperature, the smaller the resistance value.

[0053] Furthermore, the first thermistor is arranged in the outdoor environment, that is, the first thermistor is exposed to the external temperature conditions. When the outdoor environmental temperature changes, the resistance value of the first thermistor will also change accordingly. Therefore, the temperature value corresponding to the resistance value of the first thermistor can be obtained by using the conversion relationship between resistance and temperature based on the resistance value of the first thermistor, so as to characterize the outdoor environmental temperature; similarly, the second thermistor is arranged in the pipeline of the outdoor heat exchanger to monitor the pipeline temperature of the outdoor heat exchanger. When the pipeline temperature of the outdoor heat exchanger changes, the resistance value of the second thermistor will also change accordingly. Therefore, the temperature value corresponding to the resistance value of the second thermistor can be obtained by using the conversion relationship between resistance and temperature based on the resistance value of the second thermistor, so as to characterize the pipeline temperature of the outdoor heat exchanger; similarly, the third thermistor is arranged at the exhaust port of the compressor to monitor the exhaust temperature of the compressor. When the exhaust temperature of the compressor changes, the resistance value of the third thermistor will also change accordingly. Therefore, the temperature value corresponding to the resistance value of the third thermistor can be obtained by using the conversion relationship between resistance and temperature based on the resistance value of the third thermistor, so as to characterize the exhaust temperature of the compressor.

[0054] In some embodiments, as Figure 4 shown, the air conditioner 1 may include: a controller 71, and the controller 71 is configured to: obtain a first voltage value and a second voltage value; Determine a first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value; Determine the outdoor environmental temperature value based on the first temperature value; Determine the pipeline temperature value of the outdoor heat exchanger and / or the exhaust temperature value of the compressor based on the outdoor environmental temperature value; Control the operation of the compressor and / or the outdoor fan according to at least one of the outdoor environmental temperature value, the pipeline temperature value of the outdoor heat exchanger, and the exhaust temperature value of the compressor.

[0055] Specifically, during the operation of the air conditioner 1, the controller 71 can obtain the voltage values at different sampling points corresponding to different sampling ports, that is, the first voltage value of the first sampling point obtained at the first sampling port and the second voltage value of the second sampling point obtained at the second sampling port.

[0056] Further, since the resistance value of the first thermistor varies with temperature, the first temperature value corresponding to the first thermistor can be determined by the voltage values related to the first thermistor detected in real time, i.e., the first voltage value and the second voltage value, including but not limited to querying a corresponding table set according to the actual situation; Further, the outdoor ambient temperature value can be determined according to the first temperature value, including but not limited to using the first temperature value as the current outdoor ambient temperature value.

[0057] Further, the resistance value of the first thermistor can be determined according to the outdoor ambient temperature value, and by using the principle of series circuit and combining Ohm's law, the resistance values of the second thermistor and the third thermistor can be calculated. Furthermore, according to the resistance values corresponding to different thermistors, their corresponding temperature parameter values can be determined, so as to obtain the pipeline temperature value of the outdoor heat exchanger and the exhaust gas temperature value of the compressor, so as to control the operation of the compressor and / or the outdoor fan according to at least one of the outdoor ambient temperature value, the pipeline temperature value of the outdoor heat exchanger and the exhaust gas temperature value of the compressor.

[0058] According to the air conditioner 1 of the embodiment of the present invention, through circuit optimization, when the air conditioner 1 is running, two voltage values related to three thermistors can be read through two sampling ports, and the outdoor ambient temperature value, the pipeline temperature value of the outdoor heat exchanger and the exhaust gas temperature value of the compressor can be calculated according to the two voltage values, so as to control the operation of the compressor and / or the outdoor fan according to the obtained temperature values, thus achieving the effect of calculating three temperature values through two sampling ports. While simplifying the circuit structure, saving control chip resources and reducing the occupied space, the circuit power consumption is further reduced. In an embodiment of the present invention, when determining the first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value, the controller 71 is configured to: traverse the first preset table pre-stored in the controller 71; if the first voltage value and the second voltage value are found in the first preset table, obtain the first temperature value corresponding to the first voltage value and the second voltage value, where multiple groups of corresponding relationships of first voltage value - second voltage value - first temperature value are stored in the first preset table; when determining the outdoor ambient temperature value based on the first temperature value, the controller is configured to: use the first temperature value as the outdoor ambient temperature value.

[0059] Specifically, in the process of determining the first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value, when the controller 71 obtains the first voltage value and the second voltage value, it starts to traverse (i.e., check line by line or record by record) the first preset table. During the traversal, the controller 71 checks each group of voltage value combinations in the first preset table. During this process, if the first voltage value and the second voltage value are found in the first preset table, the first temperature value corresponding to the first voltage value and the second voltage value is read. It can be understood that the first preset table stores multiple groups of corresponding relationships of the first voltage value - second voltage value - first temperature value, that is, each row or each record in the first preset table represents a specific voltage value combination (the first voltage value and the second voltage value) and the corresponding first temperature value.

[0060] Further, after obtaining the first temperature value, the first temperature value can be used as the outdoor ambient temperature value.

[0061] In a specific embodiment, as shown in Table 1, the first preset table can be obtained through experimental measurement, simulation calculation, or empirical formula. For example, in the current temperature detection circuit 13, if the third thermistor is connected to a 5V power supply, the first thermistor is grounded, and the resistance of the first thermistor corresponding to the known outdoor ambient temperature value is RR, the resistance of the second thermistor is RC, and the resistance of the third thermistor is RE, the following can be calculated: V1 = 5V × RR / (RE + RC + RR); V2 = 5V × (RC + RR) / (RE + RC + RR);

[0062] Table 1 In an embodiment of the present invention, when determining the first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value, the controller 71 is configured to: traverse the first preset table pre-stored in the controller 71; If the first voltage value and the second voltage value are not found in the first preset table, control the outdoor fan 12 to operate until the first preset time is reached, and then traverse the first preset table again; If the first voltage value and the second voltage value are found again in the first preset table, obtain the first temperature value corresponding to the first voltage value and the second voltage value, where the first preset table stores multiple groups of corresponding relationships of the first voltage value - second voltage value - first temperature value; If the first voltage value and the second voltage value are not found again in the first preset table, output a fault message and control the outdoor fan 12 to stop operating.

[0063] Specifically, in the process of determining the first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value, when the controller 71 obtains the first voltage value and the second voltage value, it starts to traverse (i.e., check row by row or record by record) the first preset table. During the traversal, the controller 71 checks each set of voltage value combinations in the first preset table. During this process, if the first voltage value and the second voltage value are not found in the first preset table, the outdoor fan 12 can be controlled to operate to change the heat dissipation condition of the outdoor heat exchanger, thereby affecting the resistance value of the thermistor, and further changing the voltage value until the first preset time is reached, and then the first preset table is traversed again.

[0064] Further, if the first voltage value and the second voltage value are found again in the first preset table, the first temperature value corresponding to the first voltage value and the second voltage value is read.

[0065] Further, if the first voltage value and the second voltage value are still not found after traversing the first preset table again, it is determined that the air conditioner 1 has a fault. At this time, a fault message can be output to notify the user or the maintenance personnel to check. At the same time, the outdoor fan 12 can be controlled to stop operating to prevent further damage or safety problems.

[0066] In a specific embodiment, the first preset time can be set according to the actual situation, including but not limited to 30 minutes.

[0067] In an embodiment of the present invention, after determining the outdoor ambient temperature value based on the first temperature value, the controller 71 is further configured to: obtain the current first voltage value at the first sampling point; According to the outdoor ambient temperature value, query the second preset table pre-stored in the controller 71 to obtain the resistance value of the first thermistor corresponding to the outdoor ambient temperature value, where multiple sets of corresponding relationships between the resistance value of the first thermistor and the outdoor ambient temperature value are pre-stored in the second preset table; Determine the current passing through the first thermistor according to the resistance value of the first thermistor and the current first voltage value.

[0068] Specifically, after determining the outdoor ambient temperature value, the controller 71 can obtain the current first voltage value at the first sampling point. Further, the controller 71 can traverse (i.e., check row by row or record by record) the second preset table until the resistance value of the first thermistor corresponding to the outdoor ambient temperature value is found. It can be understood that multiple sets of corresponding relationships between the resistance value of the first thermistor and the outdoor ambient temperature value are stored in the second preset table, that is, each row or each record in the first preset table represents a combination of a specific resistance value of the first thermistor and the outdoor ambient temperature value. Among them, as shown in Table 2, the second preset table can be obtained through experimental measurement, simulation calculation or empirical formula.

[0069]

[0070] Table 2 Furthermore, since the first thermistor, the second thermistor, and the third thermistor are connected in series, the current in the circuit is equal. At the same time, since the first end of the first thermistor is grounded, the voltage difference across the first thermistor is the current first voltage value. Therefore, according to Ohm's law, the current passing through the first thermistor can be determined based on the resistance value of the first thermistor and the current first voltage value, that is, by dividing the current first voltage value by the resistance value of the first thermistor, thereby obtaining the current value passing through the first thermistor.

[0071] In a specific embodiment, if the current first voltage value is V1 and the resistance value of the first thermistor is RR, then the current passing through the first thermistor is: .

[0072] In an embodiment of the present invention, after determining the current passing through the first thermistor according to the resistance value of the first thermistor, the controller 71 is further configured to: obtain the current second voltage value at the second sampling point; Determine the resistance value of the second thermistor based on the current, the current first voltage value, and the current second voltage value; determine the second temperature value corresponding to the second thermistor based on the resistance value of the second thermistor; determine the pipeline temperature value of the outdoor heat exchanger based on the second temperature value.

[0073] Specifically, during the operation of the air conditioner 1, after determining the current passing through the first thermistor according to the resistance value of the first thermistor, according to Ohm's law, the resistance value of the second thermistor can be determined based on the current, the current first voltage value, and the current second voltage value. It can be understood that since the current is consistent in a series circuit, and the voltage at the first end of the second thermistor (i.e., the first voltage value) and the voltage at the second end of the second thermistor (i.e., the second voltage value) are known, the voltage difference across the second thermistor can be obtained, and then the resistance value of the second thermistor can be calculated.

[0074] Furthermore, the second temperature value corresponding to the second thermistor can be determined based on the resistance value of the second thermistor, including but not limited to performing a look-up table operation according to the resistance value of the second thermistor to obtain the second temperature value corresponding to the second thermistor. Further, the pipeline temperature value of the outdoor heat exchanger can be determined based on the second temperature value, including but not limited to using the second temperature value as the temperature value representing the pipeline temperature of the outdoor heat exchanger.

[0075] In an embodiment of the present invention, when determining the second temperature value corresponding to the second thermistor based on the resistance value of the second thermistor, the controller 71 is configured to: query the third preset table pre-stored in the controller 71 according to the resistance value of the second thermistor to obtain the second temperature value corresponding to the second thermistor, wherein multiple groups of corresponding relationships between the resistance value - second temperature value of the second thermistor are pre-stored in the third preset table; when determining the pipeline temperature value of the outdoor heat exchanger based on the second temperature value, the controller is configured to: use the second temperature value as the pipeline temperature value of the outdoor heat exchanger.

[0076] Specifically, after obtaining the resistance value of the second thermistor, the controller 71 can traverse (i.e., check row by row or record by record) the third preset table until finding the second temperature value corresponding to the resistance value of the second thermistor; further, the second temperature value can be used as the pipeline temperature value of the outdoor heat exchanger. It can be understood that multiple groups of corresponding relationships between the resistance value - second temperature value of the second thermistor are stored in the third preset table, that is, each row or each record in the third preset table represents a combination of a specific resistance value and second temperature value of the second thermistor. Among them, as shown in Table 3, the third preset table can be obtained through experimental measurement, simulation calculation or empirical formula.

[0077]

[0078] Table 3 In an embodiment of the present invention, after determining the current passing through the first thermistor according to the resistance value of the first thermistor, the controller 71 is further configured to: determine the resistance value of the third thermistor according to the current and the current second voltage value; determine the third temperature value corresponding to the third thermistor based on the resistance value of the third thermistor; obtain the exhaust temperature value of the compressor based on the third temperature value.

[0079] Specifically, during the operation of the air conditioner 1, after determining the current passing through the first thermistor according to the resistance value of the first thermistor, the resistance value of the third thermistor can also be determined according to Ohm's law based on the current and the current second voltage value. It can be understood that since the current is the same in a series circuit, and the voltage at the first end of the third thermistor (i.e., the current second voltage) is known, and the second end of the third thermistor is connected to a power supply with a specific voltage (such as a 5V power supply), the voltage difference across the third thermistor can be obtained, and then the resistance value of the third thermistor can be calculated.

[0080] Further, the third temperature value corresponding to the third thermistor can be determined based on the resistance value of the third thermistor, including but not limited to performing a look-up table operation according to the resistance value of the third thermistor to obtain the third temperature value corresponding to the third thermistor; further, the exhaust temperature value of the compressor can be determined based on the third temperature value, including but not limited to using the third temperature value as the temperature value representing the exhaust temperature of the compressor.

[0081] In an embodiment of the present invention, when determining the third temperature value corresponding to the third thermistor based on the resistance value of the third thermistor, the controller 71 is further configured to: query a fourth preset table pre-stored in the controller 71 according to the resistance value of the third thermistor to obtain the third temperature value corresponding to the third thermistor, wherein multiple groups of corresponding relationships between the resistance value - third temperature value of the third thermistor are pre-stored in the fourth preset table; when obtaining the exhaust temperature value of the compressor based on the third temperature value, the controller is configured to: use the third temperature value as the exhaust temperature value of the compressor.

[0082] Specifically, after obtaining the resistance value of the third thermistor, the controller 71 can traverse (i.e., check row by row or record by record) the fourth preset table until the third temperature value corresponding to the resistance value of the third thermistor is found; further, the third temperature value can be used as the exhaust temperature value of the compressor. It can be understood that multiple groups of corresponding relationships between the resistance value - third temperature value of the third thermistor are stored in the fourth preset table, that is, each row or each record in the fourth preset table represents a combination of a specific resistance value of the third thermistor and the third temperature value. Among them, as shown in Table 4, the third preset table can be obtained through experimental measurement, simulation calculation, or empirical formula.

[0083]

[0084] Table 4 In an embodiment of the present invention, before obtaining the first voltage value and the second voltage value, the controller 71 is further configured to: determine whether the air conditioner 1 meets a preset condition, where the preset condition includes: the air conditioner 1 is powered on for the first time, or when the running time of the air conditioner 1 does not exceed a second preset time, the standby time after the compressor stops running reaches a third preset time, where the second preset time is greater than the third preset time; If so, obtain the first voltage value at the first sampling point and the second voltage value at the second sampling point, otherwise, do not obtain the first voltage value at the first sampling point and the second voltage value at the second sampling point.

[0085] Specifically, before obtaining the first voltage value and the second voltage value, it is also necessary to determine whether the air conditioner 1 meets the preset conditions, that is, the air conditioner 1 is powered on for the first time, or when the operating time of the air conditioner 1 does not exceed the second preset time, the standby time after the compressor stops running reaches the third preset time. If so, obtain the first voltage value at the first sampling point and the second voltage value at the second sampling point. Otherwise, do not obtain the first voltage value at the first sampling point and the second voltage value at the second sampling point.

[0086] It can be understood that when the air conditioner 1 is powered on for the first time or the standby time after the compressor stops running reaches the third preset time, since the compressor is not working in the current state and there is no heat exchange between the indoor and outdoor, the exhaust temperature of the compressor, the pipeline temperature of the outdoor heat exchanger and the outdoor ambient temperature value are the same, that is, at this time, the exhaust temperature of the compressor, the pipeline temperature of the outdoor heat exchanger and the outdoor ambient temperature are the same temperature value. Further, in the current state, within a certain period of time (that is, within the second preset time), the outdoor ambient temperature is determined by the entire external environment, and the outdoor ambient temperature basically does not change. What changes are the exhaust temperature of the compressor and the pipeline temperature of the outdoor heat exchanger. Therefore, the resistance value of the first thermistor does not change. During operation, the first voltage value at the first sampling point and the second voltage value at the second sampling point can be continuously detected. Then, the outdoor ambient temperature value can be determined according to the first voltage value and the second voltage value, the resistance value of the first thermistor can be determined according to the outdoor ambient temperature value, and then based on Ohm's law, the resistance values of the second thermistor and the third thermistor can be determined according to the resistance value of the first thermistor, and then the pipeline temperature value of the outdoor heat exchanger corresponding to the resistance value of the second thermistor and the exhaust temperature value of the compressor corresponding to the third thermistor can be determined, so as to control the operating frequency of the compressor and the operating speed of the fan motor according to the obtained temperature values.

[0087] In a specific embodiment, both the second preset time and the third preset time can be set according to the actual situation. Among them, the second preset time can be 1 hour, and the third preset time can be 10 minutes.

[0088] In an embodiment of the present invention, the power supply module includes: a voltage conversion module, which is used to convert the input alternating current into direct current suitable for powering the controller 71, so as to power the controller 71.

[0089] Specifically, the power supply module includes a voltage conversion module, which can convert the input alternating current into direct current suitable for powering the controller 71, so as to power the controller 71. For example, the alternating current power supply inputs high-voltage alternating current into the power supply module, and the power conversion module in the power supply module converts the high-voltage alternating current (usually 220V in China, and there are also power differences in different countries. For example, it is 100V in Japan and 115V in the United States) into low-voltage direct current (usually 5V, and there is also 3.3V, etc.) to facilitate powering the controller 71.

[0090] According to the air conditioner 1 of the embodiment of the present invention, through circuit optimization, when the air conditioner 1 is running, two voltage values detected related to three thermistors can be read through two sampling ports, and the outdoor ambient temperature value, the pipeline temperature value of the outdoor heat exchanger, and the exhaust temperature value of the compressor can be calculated based on the two voltage values, so as to control the operation of the compressor and / or the outdoor fan according to the obtained temperature values, achieving the effect of calculating three temperature values through two sampling ports. While simplifying the circuit structure, saving control chip resources, reducing the occupied space, the circuit power consumption is further reduced. Further, by compiling and pre-storing the first preset table, the second preset table, the third preset table, and the fourth preset table through experimental data or actual measurement results, it is possible to directly search for calculation data, avoid complex calculation errors, and ensure the accuracy and reliability of the calculation data, thereby improving the reliability of the air conditioner 1. Further, by setting a voltage conversion module, the alternating current power supply of different voltage levels can be converted into direct current suitable for the controller 71, ensuring the stable operation of the controller 71, protecting the controller 71 from damage, and enhancing the compatibility and flexibility of the air conditioner 1.

[0091] Next, refer to Figure 6 to describe the control method of the air conditioner according to the embodiment of the present invention.

[0092] As Figure 6 shown, the control method of the air conditioner according to the embodiment of the present invention at least includes step S1-step S2.

[0093] Step S1, obtain the first voltage value and the second voltage value.

[0094] Step S2, determine the first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value.

[0095] Step S3, determine the outdoor ambient temperature value based on the first temperature value.

[0096] Step S4, determine the pipeline temperature value of the outdoor heat exchanger and / or the exhaust temperature value of the compressor based on the outdoor ambient temperature value.

[0097] Step S5, control the operation of the compressor and / or the outdoor fan according to at least one of the outdoor ambient temperature value, the pipeline temperature value of the outdoor heat exchanger, and the exhaust temperature value of the compressor.

[0098] In some embodiments, in combination with Figure 7 As shown, when determining the first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value, it specifically includes: traversing the first preset table stored in the controller; if the first voltage value and the second voltage value are found in the first preset table, then obtain the first temperature value corresponding to the first voltage value and the second voltage value, wherein multiple groups of corresponding relationships of first voltage value - second voltage value - first temperature value are stored in the first preset table; when determining the outdoor ambient temperature value based on the first temperature value, the controller is configured to: use the first temperature value as the outdoor ambient temperature value.

[0099] In some embodiments, in combination with Figure 7 As shown, when determining the first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value, it specifically includes: traversing the first preset table stored in the controller; if the first voltage value and the second voltage value are not found in the first preset table, then control the outdoor fan to operate until the first preset time is reached, and then traverse the first preset table again; if the first voltage value and the second voltage value are found again in the first preset table, then obtain the first temperature value corresponding to the first voltage value and the second voltage value, wherein multiple groups of corresponding relationships of first voltage value - second voltage value - first temperature value are stored in the first preset table; if the first voltage value and the second voltage value are not found again in the first preset table, then output a fault message and control the outdoor fan to stop operating.

[0100] In some embodiments, in combination with Figure 8 As shown, after determining the outdoor ambient temperature value based on the first temperature value, it further includes: obtaining the current first voltage value at the first sampling point; according to the outdoor ambient temperature value, query the second preset table stored in the controller to obtain the resistance value of the first thermistor corresponding to the outdoor ambient temperature value, wherein multiple groups of corresponding relationships of resistance value of the first thermistor - outdoor ambient temperature value are pre-stored in the second preset table; determine the current passing through the first thermistor according to the resistance value of the first thermistor and the current first voltage value.

[0101] In some embodiments, in combination with Figure 9 As shown, after determining the current passing through the first thermistor according to the resistance value of the first thermistor, it further includes: obtaining the current second voltage value at the second sampling point; determine the resistance value of the second thermistor according to the current, the current first voltage value, and the current second voltage value; determine the second temperature value corresponding to the second thermistor based on the resistance value of the second thermistor; determine the pipeline temperature value of the outdoor heat exchanger based on the second temperature value.

[0102] In some embodiments, when determining the second temperature value corresponding to the second thermistor based on the resistance value of the second thermistor, it specifically includes: according to the resistance value of the second thermistor, querying a third preset table pre-stored in the controller to obtain the second temperature value corresponding to the second thermistor, wherein the third preset table pre-stores multiple sets of corresponding relationships between the resistance value of the second thermistor and the second temperature value.

[0103] In some embodiments, in combination Figure 10 As shown, after determining the current passing through the first thermistor according to the resistance value of the first thermistor, it also includes: determining the resistance value of the third thermistor according to the current and the current second voltage value; determining a third temperature value corresponding to the third thermistor based on the resistance value of the third thermistor; and obtaining the exhaust temperature value of the compressor based on the third temperature value.

[0104] In some embodiments, when determining the third temperature value corresponding to the third thermistor based on the resistance value of the third thermistor, specifically including: according to the resistance value of the third thermistor, querying a fourth preset table pre-stored in the controller to obtain the third temperature value corresponding to the third thermistor, wherein the fourth preset table pre-stores a plurality of sets of correspondences between the resistance value of the third thermistor and the third temperature value; when obtaining the exhaust temperature value of the compressor based on the third temperature value, the controller is configured to: use the third temperature value as the exhaust temperature value of the compressor.

[0105] In some embodiments, before obtaining the first voltage value and the second voltage value, it also includes: determining whether the air conditioner meets a preset condition, wherein the preset condition includes: the air conditioner is powered on for the first time, or when the running time of the air conditioner does not exceed the second preset time, the time when the compressor is in standby state after stopping running reaches a third preset time, wherein the second preset time is greater than the third preset time; if so, the first voltage value at the first sampling point and the second voltage value at the second sampling point are obtained, otherwise, the first voltage value at the first sampling point and the second voltage value at the second sampling point are not obtained.

[0106] It should be noted that when controlling the air conditioner, its specific implementation method is similar to the specific implementation method of the air conditioner in any one of the above-mentioned embodiments of the present invention. Therefore, for a detailed exemplary description of the control process of the air conditioner, please refer to the aforementioned relevant description part about the air conditioner. In order to reduce redundancy, it will not be repeated here.

[0107] According to the control method of the air conditioner according to the embodiments of the present invention, when the air conditioner is operating, two voltage values detected corresponding to three thermistors can be read through two sampling ports, and the outdoor ambient temperature value, the pipeline temperature value of the outdoor heat exchanger, and the exhaust temperature value of the compressor can be calculated based on the two voltage values, so as to control the operation of the compressor and / or the fan according to the obtained temperature values, achieving the effect of calculating three temperature values with two sampling ports, while simplifying the circuit structure, saving control chip resources, reducing the occupied space, and further reducing the circuit power consumption. Further, by compiling and pre-storing the first preset table, the second preset table, the third preset table, and the fourth preset table through experimental data or actual measurement results, it is convenient to directly look up calculation data, and on the basis of avoiding complex calculation errors, the accuracy and reliability of the calculation data can be ensured, thereby improving the reliability of the air conditioner. Further, the AC power supply of different voltage levels can be converted into the DC power suitable for the controller, ensuring the stable operation of the controller, protecting the controller from damage, and enhancing the compatibility and flexibility of the air conditioner.

[0108] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", 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 representations of the above terms do not necessarily refer to the same embodiment or example.

[0109] 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: include: A refrigerant circulation loop, wherein the refrigerant performs a refrigeration cycle in a loop composed of a compressor, a condenser, an expansion valve, an evaporator and a four-way valve, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; An outdoor fan is used to drive outdoor air to pass through the outdoor heat exchanger by rotating so that the refrigerant and the outdoor air can exchange heat; A temperature detection circuit, the temperature detection circuit comprising: A power supply module, used to supply power to the controller; The controller comprises a first sampling port and a second sampling port; a first thermistor, a second thermistor, and a third thermistor connected in series; Wherein, the first thermistor is arranged in an outdoor environment, and its resistance value changes according to the outdoor ambient temperature, and the temperature converted by the resistance value of the first thermistor represents the outdoor ambient temperature; The second thermistor is arranged in the pipeline of the outdoor heat exchanger, and its resistance value changes according to the pipeline temperature value of the outdoor heat exchanger, and the temperature converted by the resistance value of the second thermistor represents the pipeline temperature value of the outdoor heat exchanger; The third thermistor is arranged at the exhaust port of the compressor, and its resistance value changes according to the exhaust temperature value of the compressor, and the temperature converted by the resistance value of the third thermistor represents the exhaust temperature value of the compressor; Wherein, the first sampling port is connected to a first sampling point between the first thermistor and the second thermistor, and is used to collect a first voltage value at the first sampling point; the second sampling port is connected to a second sampling point between the second thermistor and the third thermistor, and is used to collect a second voltage value at the second sampling point; The controller is configured to: Acquire the first voltage value and the second voltage value; Determine a first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value; determining the outdoor ambient temperature value based on the first temperature value; Determining a pipe temperature value of the outdoor heat exchanger and / or an exhaust temperature value of the compressor based on the outdoor ambient temperature value; The operation of the compressor and / or the outdoor fan is controlled according to at least one of the outdoor ambient temperature value, the pipe temperature value of the outdoor heat exchanger and the exhaust temperature value of the compressor.

2. The air conditioner according to claim 1, characterized in that: When determining a first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value, the controller is configured as follows: Traversing a first preset table pre-stored in the controller; If the first voltage value and the second voltage value are found in the first preset table, obtaining the first temperature value corresponding to the first voltage value and the second voltage value, wherein the first preset table stores a plurality of sets of correspondences about the first voltage value-the second voltage value-the first temperature value; When determining the outdoor ambient temperature value based on the first temperature value, the controller is configured to use the first temperature value as the outdoor ambient temperature value.

3. The air conditioner according to claim 1, characterized in that: When determining a first temperature value corresponding to the first thermistor according to the first voltage value and the second voltage value, the controller is configured as follows: Traversing a first preset table pre-stored in the controller; If the first voltage value and the second voltage value are not found in the first preset table, the outdoor fan is controlled to operate until a first preset time is reached, and the first preset table is traversed again; If the first voltage value and the second voltage value are found again in the first preset table, the first temperature value corresponding to the first voltage value and the second voltage value is obtained, wherein the first preset table stores a plurality of sets of correspondences about the first voltage value-the second voltage value-the first temperature value; If the first voltage value and the second voltage value are not found in the first preset table again, fault information is output and the outdoor fan is controlled to stop running.

4. The air conditioner according to claim 2 or 3, characterized in that: After determining the outdoor environment temperature value based on the first temperature value, the controller is further configured to: Acquire a current first voltage value at the first sampling point; According to the outdoor ambient temperature value, query the second preset table pre-stored in the controller to obtain the resistance value of the first thermistor corresponding to the outdoor ambient temperature value, wherein the second preset table pre-stores a plurality of sets of corresponding relationships between the resistance value of the first thermistor and the outdoor ambient temperature value; A current passing through the first thermistor is determined according to the resistance value of the first thermistor and the current first voltage value.

5. The air conditioner according to claim 4, characterized in that: After determining the current passing through the first thermistor according to the resistance value of the first thermistor, the controller is further configured to: Acquire a current second voltage value at the second sampling point; determining a resistance value of the second thermistor according to the current, the current first voltage value, and the current second voltage value; determining a second temperature value corresponding to the second thermistor based on the resistance value of the second thermistor; A pipe temperature value of the outdoor heat exchanger is determined based on the second temperature value.

6. The air conditioner according to claim 5, characterized in that: When determining a second temperature value corresponding to the second thermistor based on the resistance value of the second thermistor, the controller is configured to: According to the resistance value of the second thermistor, query the third preset table pre-stored in the controller to obtain the second temperature value corresponding to the second thermistor, wherein the third preset table pre-stores a plurality of sets of corresponding relationships between the resistance value of the second thermistor and the second temperature value; When determining the pipe temperature value of the outdoor heat exchanger based on the second temperature value, the controller is configured to use the second temperature value as the pipe temperature value of the outdoor heat exchanger.

7. The air conditioner according to claim 5, characterized in that: After determining the current passing through the first thermistor according to the resistance value of the first thermistor, the controller is further configured to: Determining a resistance value of the third thermistor according to the current and the current second voltage value; Determine a third temperature value corresponding to the third thermistor based on the resistance value of the third thermistor; An exhaust gas temperature value of the compressor is obtained based on the third temperature value.

8. The air conditioner according to claim 7, characterized in that: When determining a third temperature value corresponding to the third thermistor based on the resistance value of the third thermistor, the controller is further configured to: According to the resistance value of the third thermistor, query the fourth preset table pre-stored in the controller to obtain the third temperature value corresponding to the third thermistor, wherein the fourth preset table pre-stores a plurality of sets of corresponding relationships between the resistance value of the third thermistor and the third temperature value; When the exhaust temperature value of the compressor is obtained based on the third temperature value, the controller is configured to use the third temperature value as the exhaust temperature value of the compressor.

9. The air conditioner according to claim 1, characterized in that: Before acquiring the first voltage value and the second voltage value, the controller is further configured to: Determining whether the air conditioner meets a preset condition, wherein the preset condition includes: the air conditioner is powered on for the first time, or when the running time of the air conditioner does not exceed the second preset time, the time when the compressor is in a standby state after stopping the operation reaches a third preset time, wherein the second preset time is greater than the third preset time; If so, the first voltage value at the first sampling point and the second voltage value at the second sampling point are acquired; otherwise, the first voltage value at the first sampling point and the second voltage value at the second sampling point are not acquired.

10. The air conditioner according to claim 1, characterized in that: The power supply module comprises: The voltage conversion module is used to convert the input alternating current into direct current suitable for powering the controller, thereby powering the controller.

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