Starting method of air conditioner under low-temperature working condition, controller and air conditioner

Abstract

The invention discloses a starting method of an air conditioner under a low-temperature working condition, a controller and the air conditioner, the air conditioner comprises an electrical load, the electrical load is coupled to a power supply of the air conditioner through an aluminum electrolytic capacitor, and the starting method comprises the steps that the current environment temperature is obtained in response to a starting instruction of the air conditioner; if the current environment temperature is lower than the low temperature threshold value, current is injected into the electrical load through the aluminum electrolytic capacitor, so that the temperature of the aluminum electrolytic capacitor is increased, and the injected current is smaller than the normal working current of the electrical load; and after the injected current lasts for a first preset duration, starting the electrical load according to the starting instruction. According to the embodiment of the invention, the aluminum electrolytic capacitor is suitable for starting the air conditioner under the low-temperature working condition on the premise that the aluminum electrolytic capacitor is not improved.

Description

Technical Field

[0001] This application relates to the field of air conditioner application technology, and in particular to an air conditioner start-up method, controller and air conditioner under low temperature conditions. Background Technology

[0002] Air conditioners typically start up by charging aluminum electrolytic capacitors to handle high-power loads. However, aluminum electrolytic capacitors are susceptible to capacitance decay due to low ambient temperatures, especially in environments with temperatures ranging from -35°C to -40°C or even lower. When the capacitance of an aluminum electrolytic capacitor decays to the point where it can no longer meet the minimum capacitance required for the air conditioner to start up, the aluminum electrolytic capacitor will be damaged.

[0003] Current technologies for air conditioner startup in low-temperature conditions involve modifying the electrolyte and electrolyte solution of aluminum electrolytic capacitors. This reduces capacitor degradation at low temperatures, allowing them to maintain a tolerance within ±20% even under ultra-low temperature conditions. However, replacing the electrolyte and electrolyte solution increases costs, and the development cycle for new materials is lengthy, making it impossible to meet urgent needs. Summary of the Invention

[0004] This application provides a method, controller, and air conditioner for starting an air conditioner under low-temperature conditions, which makes the aluminum electrolytic capacitor suitable for starting the air conditioner under low-temperature conditions without modifying the aluminum electrolytic capacitor.

[0005] In a first aspect, embodiments of this application provide a method for starting an air conditioner under low-temperature conditions. The air conditioner includes an electrical load, which is coupled to the power supply of the air conditioner via an aluminum electrolytic capacitor. The starting method includes:

[0006] In response to the air conditioner's start command, the current ambient temperature is obtained;

[0007] If the current ambient temperature is lower than the low temperature threshold, current is injected into the electrical load through the aluminum electrolytic capacitor to raise the temperature of the aluminum electrolytic capacitor. The injected current is less than the normal operating current of the electrical load.

[0008] After the injected current continues for a first preset duration, the electrical load is started according to the start command.

[0009] In some embodiments, the electrical load includes a compressor and a fan; the injection of current into the electrical load through the aluminum electrolytic capacitor includes at least one of the following:

[0010] The power supply circuit from the aluminum electrolytic capacitor to the compressor is turned on, and a first current is injected into the winding of the compressor for a first duration, wherein the first current is less than the minimum current required for the winding of the compressor to rotate.

[0011] The power supply circuit from the aluminum electrolytic capacitor to the fan is turned on, and a second current is injected into the fan winding for a second duration. The second current is less than the minimum current required for the fan winding to rotate.

[0012] In some embodiments, the electrical load further includes a heating module disposed at the bottom of the compressor; after injecting a first direct current into the windings of the compressor for a first duration, the start-up method further includes:

[0013] Obtain the temperature at the bottom of the compressor;

[0014] If the temperature at the bottom of the compressor is lower than the first preset temperature, a third current is injected into the heating module for a third duration.

[0015] In some embodiments, the air conditioner further includes a thermistor and a bypass switch, the AC input terminal of the air conditioner is coupled to the aluminum electrolytic capacitor through the thermistor, and the bypass switch is connected in parallel with the thermistor; the starting method further includes, before injecting current into the electrical load through the aluminum electrolytic capacitor:

[0016] Disconnect the bypass switch and energize the circuit containing the thermistor and the aluminum electrolytic capacitor through the AC input terminal of the air conditioner;

[0017] After the power is applied for a second preset duration, the bypass switch is closed.

[0018] In some embodiments, disconnecting the bypass switch and energizing the circuit containing the thermistor and the aluminum electrolytic capacitor through the AC input terminal of the air conditioner includes:

[0019] The second preset duration is determined based on the voltage value at the AC input terminal of the air conditioner and the rated capacitance value of the aluminum electrolytic capacitor;

[0020] Disconnect the bypass switch and disconnect the power supply circuit from the aluminum electrolytic capacitor to the electrical load, and then connect the AC input terminal of the air conditioner for the second preset duration.

[0021] In some embodiments, after closing the bypass switch, the activation method further includes:

[0022] The body temperature of the aluminum electrolytic capacitor is determined based on the current ambient temperature.

[0023] The first preset duration is determined based on the body temperature of the aluminum electrolytic capacitor and the power corresponding to the injected current.

[0024] In some embodiments, the electrical load includes a compressor, a fan, and a heating module disposed at the bottom of the compressor; the injection of current into the electrical load through the aluminum electrolytic capacitor includes:

[0025] The fourth, fifth, and sixth currents are determined based on the power corresponding to the injected current, and the fourth, fifth, and sixth durations are determined based on the first preset duration.

[0026] The power supply circuit from the aluminum electrolytic capacitor to the compressor is turned on, and the fourth current is injected into the winding of the compressor for the fourth duration, wherein the fourth current is less than the minimum current required for the winding of the compressor to rotate;

[0027] After the fourth time period, the power supply circuit from the aluminum electrolytic capacitor to the compressor is turned off, and the temperature at the bottom of the compressor is obtained;

[0028] If the temperature at the bottom of the compressor is higher than the second preset temperature, the sixth duration is set to zero;

[0029] If the temperature at the bottom of the compressor is lower than the second preset temperature, the sixth current is injected into the heating module for the sixth duration.

[0030] After the sixth duration, the power supply to the heating module is disconnected, the power supply circuit from the aluminum electrolytic capacitor to the fan is turned on, and a fifth current is injected into the fan winding for the fifth duration. The fifth current is less than the minimum current required for the fan winding to rotate.

[0031] In some embodiments, after the injected current continues for a first preset duration, the electrical load is started according to the start command, including:

[0032] After the injected current has been maintained for a first preset time, the surface temperature of the aluminum electrolytic capacitor is obtained.

[0033] If the surface temperature of the aluminum electrolytic capacitor is lower than the third preset temperature, the duration of the injected current is extended.

[0034] If the surface temperature of the aluminum electrolytic capacitor is higher than the third preset temperature, the electrical load is started according to the start command.

[0035] In a second aspect, embodiments of this application provide a controller, including at least one processor and a memory for communicatively connecting to the at least one processor; the memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enable the at least one processor to perform the startup method as described in the embodiments of the first aspect above.

[0036] Thirdly, embodiments of this application provide an air conditioner, including the controller described in the embodiments of the second aspect above.

[0037] The air conditioner starting method, controller, and air conditioner in the embodiments of this application have at least the following beneficial effects: When starting the air conditioner based on a conventional aluminum electrolytic capacitor, the current ambient temperature is detected. If the current ambient temperature is lower than the low temperature threshold, the current injected into the electrical load through the aluminum electrolytic capacitor is small and will not cause the electrical load to start normally or damage the aluminum electrolytic capacitor. Since the aluminum electrolytic capacitor has an equivalent internal resistance, heat is generated when the injected current flows through the aluminum electrolytic capacitor, thereby increasing the temperature of the aluminum electrolytic capacitor. When the injected current continues for a first preset time, it is considered that the capacitance value of the aluminum electrolytic capacitor has recovered to a level that allows normal start-up. Then, the air conditioner is started normally according to the start-up command. In this way, the air conditioner can be started in low temperature conditions or even ultra-low temperature conditions without modifying the aluminum electrolytic capacitor.

[0038] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description and the accompanying drawings. Attached Figure Description

[0039] Figure 1 This is a circuit diagram of an aluminum electrolytic capacitor preheating control circuit provided in an embodiment of this application;

[0040] Figure 2 This is a flowchart of a method for starting an air conditioner under low-temperature conditions, provided in an embodiment of this application.

[0041] Figure 3 This is a flowchart of a method for injecting current into an electrical load through an aluminum electrolytic capacitor, as provided in an embodiment of this application.

[0042] Figure 4 This is a flowchart of a method for injecting current into a heating module according to an embodiment of this application;

[0043] Figure 5 This is a flowchart of a method for heating an aluminum electrolytic capacitor by a thermistor by controlling the open and / or closed state of a bypass switch, as provided in an embodiment of this application.

[0044] Figure 6 This is a flowchart of a method for supplying power to the circuit containing the thermistor and aluminum electrolytic capacitor through the AC input terminal of an air conditioner, according to an embodiment of this application.

[0045] Figure 7This is a flowchart of a method for determining a first preset duration provided in an embodiment of this application;

[0046] Figure 8 This is a flowchart of a method for injecting current into an electrical load through an aluminum electrolytic capacitor, provided in another embodiment of this application;

[0047] Figure 9 This is a flowchart illustrating a method for starting an electrical load according to a start command, as provided in an embodiment of this application.

[0048] Figure 10 This is a flowchart of a method for starting an air conditioner under low-temperature conditions, provided in another embodiment of this application;

[0049] Figure 11 This is a schematic diagram of the structure of a controller provided in an embodiment of this application. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various implementations. Simultaneously, the steps or actions described in the method description can be rearranged or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various orders in the specification and drawings are merely for the clear description of a particular embodiment and do not imply a mandatory order, unless otherwise stated that a particular order must be followed.

[0051] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0052] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0053] In cold weather, the aluminum electrolytic capacitors in air conditioners are easily affected by low temperatures, resulting in significant capacitance degradation. Relevant test data shows that at -25℃, the capacitance tolerance of aluminum electrolytic capacitors meets ±20% with sufficient margin; at -30℃, the tolerance meets ±20%, but the margin is smaller; at -35℃, the tolerance does not meet ±20%, remaining within ±30%; and at -40℃, the tolerance does not meet ±20%, remaining within ±43%. Therefore, as the operating temperature decreases, the capacitance of aluminum electrolytic capacitors degrades more severely. When the capacitance value degrades to the point where it cannot meet the minimum capacitance required for air conditioner startup, the aluminum electrolytic capacitor is prone to failure or damage, or its lifespan will be reduced.

[0054] In related technologies, by modifying the electrolyte and electrolyte solution of aluminum electrolytic capacitors, the capacitor degradation at low temperatures is reduced, allowing them to maintain a tolerance within ±20% even under ultra-low temperature conditions. However, changing the electrolyte solution alters the inherent properties of the aluminum electrolytic capacitor, leading to two drawbacks. First, it increases material costs; newly developed aluminum electrolytic capacitors require higher-quality electrolyte materials, increasing costs by approximately 10%. Second, it lengthens the development cycle; newly developed aluminum electrolytic capacitors used in air conditioners require testing of individual capacitors, overall ripple current testing, and limiting current heating tests, which cannot meet urgent needs.

[0055] Based on this, this application provides a method, controller, and air conditioner for starting an air conditioner under low-temperature conditions. When starting the air conditioner using a conventional aluminum electrolytic capacitor, the current ambient temperature is detected. If the current ambient temperature is lower than the low-temperature threshold, a small current is injected into the electrical load through the aluminum electrolytic capacitor. This injected current will not cause the electrical load to start normally or damage the aluminum electrolytic capacitor. Since the aluminum electrolytic capacitor has an equivalent internal resistance, heat is generated when the injected current flows through it, thereby increasing the temperature of the aluminum electrolytic capacitor. When the injected current continues for a first preset time, the capacitance value of the aluminum electrolytic capacitor is considered to have recovered to a level suitable for normal start-up. Then, the air conditioner is started normally according to the start-up command. In this way, the air conditioner can be started in low-temperature or even ultra-low-temperature conditions without modifying the aluminum electrolytic capacitor.

[0056] The following description, with reference to the accompanying drawings, explains the start-up method, controller, and air conditioner under low-temperature conditions.

[0057] Reference Figure 1 As shown, Figure 1This is a circuit diagram of a control circuit for an air conditioner provided in an embodiment of this application. The control circuit includes a power supply, a thermistor, a bypass switch, a rectifier bridge, an aluminum electrolytic capacitor, a main control board control unit, and electrical loads. The electrical loads are coupled to the air conditioner's power supply through the aluminum electrolytic capacitor. The air conditioner's electrical loads include a compressor inverter and compressor, and a fan inverter and fan. It can be understood that the voltage output from the power supply flows to the compressor and fan, thus the compressor and fan are downstream loads. The positive terminal of the power supply is connected to the first end of the thermistor, the second end of the thermistor is connected to the input terminal of the rectifier bridge, the output terminal of the rectifier bridge is connected to the first end of the aluminum electrolytic capacitor, and the second end of the aluminum electrolytic capacitor is connected to the negative terminal of the power supply. The bypass switch and the thermistor are connected in parallel, and the aluminum electrolytic capacitor and the electrical loads are connected in parallel, using the voltage across the aluminum electrolytic capacitor to supply power to the electrical loads. It is understood that in some embodiments of this application, the control circuit of the air conditioner also includes an ambient temperature sensor, which is connected to the main control board control unit. The ambient temperature sensor is used to acquire the current ambient temperature. In response to the start command of the air conditioner, the current ambient temperature is acquired. If the current ambient temperature is lower than the low temperature threshold, the AC current output from the positive terminal of the power supply passes through the thermistor to form a charging circuit of positive terminal of the power supply - thermistor - rectifier bridge - aluminum electrolytic capacitor - negative terminal of the power supply. During the charging process, since the aluminum electrolytic capacitor has an equivalent internal resistance, heat is generated when the current flows through the aluminum electrolytic capacitor, thereby increasing the temperature of the aluminum electrolytic capacitor. In addition, the thermistor generates a lot of heat when the current flows through it. Part of the heat generated by the thermistor is transferred to the aluminum electrolytic capacitor, further increasing the temperature of the aluminum electrolytic capacitor. This avoids the problem that the capacitance value of the aluminum electrolytic capacitor will decay to the point where it cannot meet the minimum capacitance value for the air conditioner to start, thus preventing the air conditioner from failing to start. When the capacitance value of the aluminum electrolytic capacitor recovers to a level that allows normal start-up, the air conditioner starts normally according to the start command.

[0058] It should be noted that within the preset time interval after the charging circuit is formed, the bypass switch needs to be closed to prevent excessive current from continuously flowing through the thermistor, which could damage the air conditioner's control circuit. If the capacitance of the aluminum electrolytic capacitor has not recovered to a level sufficient for normal startup after the bypass switch is closed, the aluminum electrolytic capacitor needs to inject current into the electrical load to raise its temperature. This addresses the issue of the aluminum electrolytic capacitor's capacitance decreasing to a level insufficient to meet the minimum starting capacitance of the air conditioner, thus preventing it from starting.

[0059] In some embodiments of this application, the AC power output of the power supply is 220V. Those skilled in the art can set the voltage value of the power supply according to the actual situation. The embodiments of this application do not limit the voltage value of the power supply.

[0060] Reference Figure 2 As shown, Figure 2 This is a flowchart illustrating a method for starting an air conditioner under low-temperature conditions, as provided in an embodiment of this application. The method includes, but is not limited to, steps S100 to S300. Specifically,

[0061] Step S100: In response to the start command of the air conditioner, obtain the current ambient temperature;

[0062] Step S200: If the current ambient temperature is lower than the low temperature threshold, inject current into the electrical load through the aluminum electrolytic capacitor to raise the temperature of the aluminum electrolytic capacitor. The injected current is less than the normal operating current of the electrical load.

[0063] Step S300: After the injected current continues for a first preset time, the electrical load is started according to the start command.

[0064] In some embodiments of this application, the air conditioner includes an electrical load coupled to the air conditioner's power supply via an aluminum electrolytic capacitor. The air conditioner also includes an ambient temperature sensor and a main control board control unit. The ambient temperature sensor is connected to the main control board control unit and is used to acquire the current ambient temperature. The air conditioner's startup method under low-temperature conditions includes: upon receiving a startup command from the air conditioner, in response to the startup command, the ambient temperature sensor acquires the current ambient temperature and transmits it to the main control board control unit. The main control board control unit determines whether the current ambient temperature is below a low-temperature threshold. If the current ambient temperature is below the low-temperature threshold, confirming that the aluminum electrolytic capacitor is in a low-temperature condition, current needs to be injected into the electrical load through the aluminum electrolytic capacitor to raise its temperature. It should be noted that the injected current needs to be less than the normal operating current of the electrical load to ensure that the injected current is small enough not to cause the electrical load to start normally or damage the aluminum electrolytic capacitor. Because aluminum electrolytic capacitors have an equivalent internal resistance, the injected current generates heat when flowing through them, thus raising their temperature. When the injected current continues for a first preset duration, the capacitance of the aluminum electrolytic capacitor is considered to have recovered to a level suitable for normal startup, and the air conditioner starts normally according to the startup command. Through this method, the air conditioner can be started in low-temperature or even ultra-low-temperature conditions without modifying the aluminum electrolytic capacitor.

[0065] It is understood that in some embodiments of this application, the start command of the air conditioner may be a start command sent by the user through the air conditioner, a start command set by the user via a timer, or a start command sent by the user by touching a switch button. This application does not limit the source of the start command. In response to the start command of the air conditioner, the current ambient temperature is obtained and compared with a low-temperature threshold to determine the corresponding start method based on the temperature comparison result. It is understood that when the current ambient temperature is lower than the low-temperature threshold, current is injected into the electrical load through the aluminum electrolytic capacitor to raise the temperature of the aluminum electrolytic capacitor, and the injected current is less than the normal operating current of the electrical load. When the current ambient temperature is higher than the low-temperature threshold, the electrical load is started according to the start command.

[0066] It should be noted that the injected current is less than the normal operating current of the electrical load, thereby preventing the electrical load from starting and operating when the capacitance value of the aluminum electrolytic capacitor does not meet the minimum capacitance value for the air conditioner to start. This effectively prevents damage to the aluminum electrolytic capacitor and improves the safety and reliability of the air conditioner's control circuit.

[0067] It should be noted that in some embodiments of this application, the electrical load includes downstream loads such as compressors and fans. When the current ambient temperature is below the low temperature threshold, the current output by the power supply supplies power to the downstream loads through aluminum electrolytic capacitors, such as injecting current into downstream loads such as compressors and / or fans, so as to raise the temperature of the aluminum electrolytic capacitors, thereby restoring the capacitance value of the aluminum electrolytic capacitors to the level of normal startup.

[0068] Reference Figure 3 As shown, Figure 3 This is a flowchart illustrating a method for injecting current into an electrical load using an aluminum electrolytic capacitor, as provided in an embodiment of this application. The method includes, but is not limited to, steps S210 to S220. Specifically,

[0069] Step S210: Turn on the power supply circuit from the aluminum electrolytic capacitor to the compressor, inject the first current into the compressor winding for a first duration, and the first current is less than the minimum current required for the compressor winding to rotate.

[0070] Step S220: Turn on the power supply circuit from the aluminum electrolytic capacitor to the fan, and inject the second current into the fan winding for a second duration. The second current is less than the minimum current required for the fan winding to rotate.

[0071] In some embodiments of this application, in response to the start command of the air conditioner, the current ambient temperature is obtained. If the current ambient temperature is lower than the low temperature threshold, current is injected into the electrical load through the aluminum electrolytic capacitor to raise the temperature of the aluminum electrolytic capacitor. The electrical load includes a compressor and a fan. In one embodiment, the method of injecting current into the electrical load through the aluminum electrolytic capacitor includes: only turning on the power supply circuit from the aluminum electrolytic capacitor to the compressor; injecting a first current into the compressor winding for a first duration through the main control board control unit; the first current being less than the minimum current required for the compressor winding to rotate, so that the compressor winding is in a non-operating state; in the non-operating state, the compressor winding heats up, and the heat generated by the compressor winding can be transferred to the aluminum electrolytic capacitor, and the temperature of the aluminum electrolytic capacitor will rise with the heat generated by the heating of the compressor winding; in addition, in the power supply circuit from the aluminum electrolytic capacitor to the compressor, current flows through the aluminum electrolytic capacitor. Since the aluminum electrolytic capacitor has an equivalent internal resistance, the equivalent resistance inside the aluminum electrolytic capacitor will do work to generate heat, causing the temperature of the aluminum electrolytic capacitor to rise.

[0072] It should be noted that by injecting a first current less than the minimum current required for the compressor windings to rotate, the compressor can be prevented from starting and operating, effectively preventing damage to the aluminum electrolytic capacitors. Aluminum electrolytic capacitors experience minimal capacitance loss in low-power power supply circuits, thus avoiding the problem of large capacitance loss in aluminum electrolytic capacitors.

[0073] In another embodiment, the method of injecting current into an electrical load via an aluminum electrolytic capacitor includes: only opening the power supply circuit from the aluminum electrolytic capacitor to the fan; injecting a second current into the fan winding for a second duration via the main control board control unit; the second current being less than the minimum current required for the fan winding to rotate, thus keeping the fan winding in a non-operating state; and, in the non-operating state, causing the fan winding to heat up. The heat generated by the fan winding can be transferred to the aluminum electrolytic capacitor, and the temperature of the aluminum electrolytic capacitor will rise with the heat generated by the fan winding. In addition, in the power supply circuit from the aluminum electrolytic capacitor to the fan, current flows through the aluminum electrolytic capacitor. Since the aluminum electrolytic capacitor has an equivalent internal resistance, the equivalent resistance inside the aluminum electrolytic capacitor will do work to generate heat, causing the temperature of the aluminum electrolytic capacitor to rise.

[0074] It should be noted that by injecting a second current less than the minimum current required for the fan windings to rotate, the fan can be prevented from starting and operating, effectively preventing damage to the aluminum electrolytic capacitors. Aluminum electrolytic capacitors experience minimal capacitance loss in low-power power supply circuits, thus avoiding the problem of large capacitance loss in aluminum electrolytic capacitors.

[0075] In another embodiment, the method of injecting current into an electrical load through an aluminum electrolytic capacitor includes: opening a power supply circuit from the aluminum electrolytic capacitor to the compressor and opening a power supply circuit from the aluminum electrolytic capacitor to the fan; injecting a first current into the winding of the compressor for a first duration, wherein the first current is less than the minimum current required for the winding of the compressor to rotate; and injecting a second current into the winding of the fan for a second duration, wherein the second current is less than the minimum current required for the winding of the fan to rotate.

[0076] By simultaneously opening the power supply circuits from the aluminum electrolytic capacitor to the compressor and from the aluminum electrolytic capacitor to the fan, the heat generated by the compressor windings and the fan windings can be transferred to the aluminum electrolytic capacitor, causing its temperature to rise. Furthermore, the current in both the power supply circuits from the aluminum electrolytic capacitor to the compressor and to the fan flows through the aluminum electrolytic capacitor simultaneously, increasing the current flowing through it. Because the aluminum electrolytic capacitor has an equivalent internal resistance, this increased current causes it to generate more heat through its internal resistance, further raising its temperature. This allows the capacitance value of the aluminum electrolytic capacitor to return to a level suitable for normal startup, enabling the air conditioner to start normally according to the startup command.

[0077] In this embodiment, by setting an electrical load including a compressor and a fan, in response to the start command of the air conditioner, the current ambient temperature is first obtained, and current is injected into the electrical load through an aluminum electrolytic capacitor to raise the temperature of the aluminum electrolytic capacitor. If the current ambient temperature is below the low-temperature threshold, the number of power supply circuits to be activated can be determined based on the difference between the current ambient temperature and the low-temperature threshold. This allows for selective control of the power supply circuit from the aluminum electrolytic capacitor to the compressor and the power supply circuit from the aluminum electrolytic capacitor to the fan. Specifically, if the current ambient temperature is below the low-temperature threshold and the difference between them is small, either the power supply circuit from the aluminum electrolytic capacitor to the compressor or the power supply circuit from the aluminum electrolytic capacitor to the fan can be activated, while the other power supply circuit is deactivated. If the current ambient temperature is below the low-temperature threshold and the difference between them is large, both the power supply circuit from the aluminum electrolytic capacitor to the compressor and the power supply circuit from the aluminum electrolytic capacitor to the fan can be activated simultaneously to accelerate the heating rate of the aluminum electrolytic capacitor. This allows the capacitance value of the aluminum electrolytic capacitor to quickly recover to a level suitable for normal startup, and then the air conditioner can start normally according to the start command.

[0078] Reference Figure 4 As shown, Figure 4 This is a flowchart of a method for injecting current into a heating module according to an embodiment of this application. The method for injecting current into a heating module includes, but is not limited to, steps S211 to S212. Specifically,

[0079] Step S211: Obtain the temperature of the bottom of the compressor;

[0080] Step S212: If the temperature at the bottom of the compressor is lower than the first preset temperature, inject the third current into the heating module for a third duration.

[0081] In some embodiments of this application, the electrical load further includes a heating module disposed at the bottom of the compressor. After injecting a first DC current into the compressor windings for a first duration, the air conditioner's startup method under low-temperature conditions further includes injecting current into the heating module. Injecting current into the heating module includes: acquiring the temperature at the bottom of the compressor and comparing it with a first preset temperature; if the temperature at the bottom of the compressor is lower than the first preset temperature, then injecting a third current into the heating module for a third duration. By adding a heating module at the bottom of the compressor and injecting a third current into the heating module for a third duration, the heating module generates heat, which can be transferred to the aluminum electrolytic capacitor, causing the temperature of the aluminum electrolytic capacitor to rise with the heat generated by the heating module. Additionally, in the power supply circuit from the aluminum electrolytic capacitor to the compressor, current flows through the aluminum electrolytic capacitor. Due to the equivalent internal resistance of the aluminum electrolytic capacitor, the equivalent resistance inside the aluminum electrolytic capacitor does work and generates heat, causing the temperature of the aluminum electrolytic capacitor to rise. Furthermore, the capacitance loss of the aluminum electrolytic capacitor in the low-power power supply circuit is small, avoiding the problem of large capacitance loss in the aluminum electrolytic capacitor. If the temperature at the bottom of the compressor is higher than the first preset temperature, the power supply circuit from the aluminum electrolytic capacitor to the fan is turned on, and a second current is injected into the fan winding for a second duration. The second current is less than the minimum current required for the fan winding to rotate.

[0082] It should be noted that under ultra-low temperature conditions, the cooling oil and refrigerant at the bottom of the compressor will mix together. Therefore, before injecting the third current into the heating module for the third duration, it is necessary to determine whether the temperature at the bottom of the compressor is under ultra-low temperature conditions. If the temperature at the bottom of the compressor is under ultra-low temperature conditions, the bottom of the compressor needs to be preheated. Specifically, the method for preheating the bottom of the compressor includes: first, obtaining the temperature of the bottom of the compressor; if the temperature at the bottom of the compressor is lower than a fourth preset temperature, and the fourth preset temperature is lower than a first preset temperature, then it is determined whether the temperature at the bottom of the compressor is under ultra-low temperature conditions. At this time, a preset preheating current value needs to be injected into the heating module for the third preset duration to preheat the bottom of the compressor, thereby separating the refrigerant from the compressor cooling oil. It should be noted that the preheating current value is less than the normal operating current of the heating module, so that the capacitance value lost by the heating module in the low-power power supply circuit is small, avoiding the problem of large capacitance value loss of aluminum electrolytic capacitors. The purpose of preheating the bottom of the compressor is to prevent the refrigerant and oil mixture from being carried into the pipeline by the compressor when it starts up, which would cause hydraulic pressure on the compressor and increase the load on the air conditioning system.

[0083] In one embodiment, the heating module is a DC heating belt. By adding a DC heating belt to the bottom of the compressor, after preheating, it is determined whether the bottom temperature of the compressor is overheated. If the bottom temperature is lower than a fifth preset temperature, it is determined that the bottom temperature of the compressor is not overheated. At this time, the DC heating belt is turned on for a third duration, causing the temperature of the aluminum electrolytic capacitor to rise, so that the capacitance value of the aluminum electrolytic capacitor can quickly recover to a level suitable for normal start-up. If the bottom temperature of the compressor is higher than the fifth preset temperature, it is determined that the bottom temperature of the compressor is overheated. The step of turning on the DC heating belt for a third duration is skipped, and the process directly enters the fan winding heating mode. The power supply circuit from the aluminum electrolytic capacitor to the fan is activated, and a second current is injected into the fan winding for a second duration. This second current is less than the minimum current required for the fan winding to rotate, and the temperature of the aluminum electrolytic capacitor is raised by the heating of the fan winding.

[0084] It should be noted that in some embodiments of this application, the fifth preset temperature is -20°C. When the temperature at the bottom of the compressor is greater than the fifth preset temperature, and it is determined that the bottom of the compressor is overheated, the step of continuously turning on the DC heating belt for a third duration is skipped, and the process directly enters the fan winding heating mode. This application does not limit the magnitude of the fifth preset temperature; those skilled in the art can set the magnitude of the fifth preset temperature according to actual conditions.

[0085] Reference Figure 5 As shown, Figure 5This is a flowchart illustrating a method for heating an aluminum electrolytic capacitor using a thermistor by controlling the open and / or closed state of a bypass switch, as provided in an embodiment of this application. The method includes, but is not limited to, steps S110 to S120. Specifically,

[0086] Step S110: Disconnect the bypass switch and energize the circuit containing the thermistor and aluminum electrolytic capacitor through the AC input terminal of the air conditioner;

[0087] Step S120: After the power is on for a second preset time, close the bypass switch.

[0088] In some embodiments of this application, the air conditioner further includes a thermistor and a bypass switch. The AC input terminal of the air conditioner is coupled to an aluminum electrolytic capacitor through the thermistor. The bypass switch is connected in parallel with the thermistor. Before injecting current into the electrical load through the aluminum electrolytic capacitor, the air conditioner's startup method under low-temperature conditions further includes controlling the open and / or closed state of the bypass switch to heat the aluminum electrolytic capacitor through the thermistor. This includes: opening the bypass switch, energizing the circuit containing the thermistor and the aluminum electrolytic capacitor through the AC input terminal of the air conditioner, and closing the bypass switch after the energizing continues for a second preset time. First, opening the bypass switch allows the voltage output from the AC input terminal of the air conditioner to energize the circuit containing the thermistor and the aluminum electrolytic capacitor. Since the aluminum electrolytic capacitor has an equivalent internal resistance, the equivalent resistance inside the aluminum electrolytic capacitor will do work to generate heat, causing the temperature of the aluminum electrolytic capacitor to rise, thereby achieving preheating of the aluminum electrolytic capacitor. Because the power of the circuit containing the thermistor is relatively large, it will consume part of the capacitance value of the aluminum electrolytic capacitor, and the current in the circuit containing the thermistor is relatively large, which can easily damage the aluminum electrolytic capacitor. Therefore, after the AC input terminal of the air conditioner supplies power to the circuit containing the thermistor and aluminum electrolytic capacitor for a second preset time, the bypass switch needs to be closed to disconnect the AC input terminal of the air conditioner from the circuit containing the thermistor and aluminum electrolytic capacitor. This prevents the AC input terminal of the air conditioner from supplying power to the circuit containing the thermistor and aluminum electrolytic capacitor, thereby reducing the loss of capacitance value of the aluminum electrolytic capacitor and preventing damage to the aluminum electrolytic capacitor.

[0089] Understandably, the AC input terminal of the air conditioner is... Figure 1 The AC power output from the AC input terminal of the air conditioner is 220V. This application embodiment does not limit the magnitude of the AC power output from the AC input terminal of the air conditioner.

[0090] Reference Figure 6 As shown, Figure 6This is a flowchart illustrating a method for supplying power to the circuit containing the thermistor and aluminum electrolytic capacitor via the AC input terminal of an air conditioner, according to an embodiment of this application. The method includes, but is not limited to, steps S111 to S112. Specifically,

[0091] Step S111: Determine the second preset duration based on the voltage value at the AC input terminal of the air conditioner and the rated capacitance value of the aluminum electrolytic capacitor;

[0092] Step S112: Disconnect the bypass switch and disconnect the power supply circuit from the aluminum electrolytic capacitor to the electrical load, and connect the power supply to the AC input terminal of the air conditioner for a second preset duration.

[0093] In some embodiments of this application, the energizing duration of the circuit containing the thermistor and the aluminum electrolytic capacitor is related to the voltage value at the AC input terminal of the air conditioner and the rated capacitance value of the aluminum electrolytic capacitor. The method of energizing the circuit containing the thermistor and the aluminum electrolytic capacitor through the AC input terminal of the air conditioner includes: determining a second preset duration based on the voltage value at the AC input terminal of the air conditioner and the rated capacitance value of the aluminum electrolytic capacitor; after determining the second preset duration, disconnecting the bypass switch and disconnecting the power supply circuit from the aluminum electrolytic capacitor to the electrical load; connecting the power supply at the AC input terminal of the air conditioner for the second preset duration; and then energizing the circuit containing the thermistor and the aluminum electrolytic capacitor through the AC input terminal of the air conditioner for the second preset duration.

[0094] Because the circuit containing the thermistor has a high power consumption, it consumes some of the capacitance of the aluminum electrolytic capacitor. Furthermore, the current in this circuit is also high, which can easily damage the aluminum electrolytic capacitor. Therefore, it is necessary to control the energizing time of the circuit containing the thermistor and the aluminum electrolytic capacitor. It is understood that the higher the AC input voltage of the air conditioner, the smaller the rated capacitance of the aluminum electrolytic capacitor, and thus the shorter the second preset time. Conversely, the lower the AC input voltage of the air conditioner, the larger the rated capacitance of the aluminum electrolytic capacitor, and thus the longer the second preset time. Those skilled in the art can determine the second preset time based on the AC input voltage of the air conditioner and the rated capacitance of the aluminum electrolytic capacitor. This application does not limit the magnitude of the second preset time.

[0095] Reference Figure 7 As shown, Figure 7 This is a flowchart of a method for determining a first preset duration provided in an embodiment of this application. The method for determining the first preset duration includes, but is not limited to, steps S400 to S410. Specifically,

[0096] Step S400: Determine the body temperature of the aluminum electrolytic capacitor based on the current ambient temperature;

[0097] Step S410: Determine the first preset duration based on the body temperature of the aluminum electrolytic capacitor and the power corresponding to the injected current.

[0098] In some embodiments of this application, in response to the start command of the air conditioner, the current ambient temperature is obtained; if the current ambient temperature is lower than the low temperature threshold, current is injected into the electrical load through the aluminum electrolytic capacitor to raise the temperature of the aluminum electrolytic capacitor, and the injected current is less than the normal operating current of the electrical load; after the injected current continues for a first preset duration, the electrical load is started according to the start command. The first preset duration is related to the current ambient temperature, the body temperature of the aluminum electrolytic capacitor, and the power corresponding to the injected current. The method for determining the first preset duration includes: first, obtaining the current ambient temperature; determining the body temperature of the aluminum electrolytic capacitor based on the current ambient temperature. It can be understood that in the embodiments of this application, a one-to-one correspondence between the current ambient temperature and the body temperature of the aluminum electrolytic capacitor is determined through prior experiments and a temperature lookup table is prepared. Therefore, by obtaining the current ambient temperature, the body temperature of the aluminum electrolytic capacitor can be quickly determined from the temperature lookup table. Then, the first preset duration is determined based on the body temperature of the aluminum electrolytic capacitor and the power corresponding to the injected current. Current is then injected into the electrical load through the aluminum electrolytic capacitor for the first preset duration, and then the electrical load is started according to the start command.

[0099] In one embodiment, the four elements—current ambient temperature T4, aluminum electrolytic capacitor body temperature Te, electrical load power Pw, and continuous first preset duration t_set—need to be selected through extensive laboratory testing to determine a suitable combination. For example, when the air conditioner is operating at -35℃ and the electrical load power is 100W, a continuous preheating first preset duration t_set of 30 minutes can preheat the aluminum electrolytic capacitor body temperature from -35℃ to -25℃. This example data will be added to the temperature query table of the running program. When the current ambient temperature T4 is -35℃, the air conditioner will not directly run the compressor or other high DC loads upon power-on. The air conditioner will wait for the thermistor PTC1 to preheat the aluminum electrolytic capacitor for t0 time, then close the bypass switch RY1, and then turn on the DC heating belt, fan winding heating, or compressor winding heating, etc. After preheating for the first preset duration t_set, the electrical load will be started according to the start command to enter the normal air conditioner start-up program.

[0100] Reference Figure 8 As shown, Figure 8 This is a flowchart of a method for injecting current into an electrical load through an aluminum electrolytic capacitor, provided in another embodiment of this application. The method includes, but is not limited to, steps S500 to S550. Specifically,

[0101] Step S500: Determine the fourth current, the fifth current and the sixth current according to the power corresponding to the injected current, and determine the fourth duration, the fifth duration and the sixth duration according to the first preset duration;

[0102] Step S510: Turn on the power supply circuit from the aluminum electrolytic capacitor to the compressor, and inject the fourth current into the compressor winding for a fourth duration. The fourth current is less than the minimum current required for the compressor winding to rotate.

[0103] Step S520: After the fourth time interval, disconnect the power supply circuit from the aluminum electrolytic capacitor to the compressor and obtain the temperature at the bottom of the compressor;

[0104] Step S530: If the temperature at the bottom of the compressor is higher than the second preset temperature, set the sixth duration to zero;

[0105] Step S540: If the temperature at the bottom of the compressor is lower than the second preset temperature, inject the sixth current into the heating module for a sixth duration;

[0106] Step S550: After the sixth time period, disconnect the power supply to the heating module, open the power supply circuit from the aluminum electrolytic capacitor to the fan, and inject the fifth current into the fan winding for the fifth time period. The fifth current is less than the minimum current required for the fan winding to rotate.

[0107] In some embodiments of this application, the electrical load of the air conditioner includes a compressor, a fan, and a heating module disposed at the bottom of the compressor; in response to the start command of the air conditioner, the current ambient temperature is obtained; if the current ambient temperature is lower than the low temperature threshold, current is injected into the electrical load through an aluminum electrolytic capacitor, which includes: firstly, determining a fourth current, a fifth current, and a sixth current according to the power corresponding to the injected current, and determining a fourth duration, a fifth duration, and a sixth duration based on a first preset duration; the fourth current is the current injected into the winding of the compressor, the fourth duration is the duration of the fourth current injected into the winding of the compressor, the fifth current is the current injected into the winding of the fan, the fifth duration is the duration of the fifth current injected into the winding of the fan, and the sixth current is the current injected into the heating module, the sixth duration is the duration of the sixth current injected into the heating module. The power supply circuit from the aluminum electrolytic capacitor to the compressor is opened, and a fourth current is injected into the compressor windings for a fourth duration. This fourth current is less than the minimum current required for the compressor windings to rotate, causing the compressor windings to stop. With the compressor not running, the compressor windings heat up. The aluminum electrolytic capacitor has a small load in the low-power circuit, and after four hours of continuous operation, the aluminum electrolytic capacitor itself will heat up due to the work done by its internal resistance. The temperature of the aluminum electrolytic capacitor will also rise as the compressor windings heat up. After the fourth duration, the power supply circuit from the aluminum electrolytic capacitor to the compressor is closed, and the temperature of the compressor's bottom is measured. If the temperature of the compressor's bottom is higher than the second preset temperature, it is considered overheated, and the heating module at the bottom of the compressor is skipped, and the sixth duration is reset to zero. If the temperature of the compressor's bottom is lower than the second preset temperature, the sixth current is injected into the heating module for a sixth duration. The heat generated by the heating module causes the aluminum electrolytic capacitor to heat up. The temperature of the aluminum electrolytic capacitor rises so that its capacitance value can recover. After six hours, the power supply to the heating module is disconnected, and the power supply circuit from the aluminum electrolytic capacitor to the fan is opened. The fifth current is injected into the fan winding for five hours. The fifth current is less than the minimum current required for the fan winding to rotate, so the fan winding does not rotate. When the fan winding does not rotate, the fan winding heats up. The aluminum electrolytic capacitor has a small load in the low-power circuit and continues to work for five hours. Due to the work done by the internal resistance, the aluminum electrolytic capacitor body heats up.

[0108] By determining the current and duration injected into the compressor windings, the fan windings, and the heating module based on the power corresponding to the injected current, the compressor windings, fan windings, and heating module work together to raise the temperature of the aluminum electrolytic capacitor to the low-temperature threshold. This ensures that the capacitance of the aluminum electrolytic capacitor returns to the level required for normal air conditioner startup, and then the electrical load is started according to the startup command. Through this method, the air conditioner can start in low-temperature and even ultra-low-temperature conditions without modifying the aluminum electrolytic capacitor.

[0109] Reference Figure 9 As shown, Figure 9 This is a flowchart illustrating a method for starting an electrical load according to a start command, as provided in an embodiment of this application. The method includes, but is not limited to, steps S310 to S330. Specifically,

[0110] Step S310: After the injected current continues for a first preset time, the surface temperature of the aluminum electrolytic capacitor is obtained;

[0111] Step S320: If the surface temperature of the aluminum electrolytic capacitor is lower than the third preset temperature, extend the duration of the injected current.

[0112] Step S330: If the surface temperature of the aluminum electrolytic capacitor is higher than the third preset temperature, start the electrical load according to the start command.

[0113] In some embodiments of this application, the air conditioner is further provided with a capacitor temperature sensor. The capacitor temperature sensor is used to obtain the surface temperature of the aluminum electrolytic capacitor. The method for starting the electrical load according to the start command includes: after the injected current continues for a first preset time, obtaining the surface temperature of the aluminum electrolytic capacitor, and determining the magnitude of the surface temperature of the aluminum electrolytic capacitor and a third preset temperature. If the surface temperature of the aluminum electrolytic capacitor is lower than the third preset temperature, it indicates that the surface temperature of the aluminum electrolytic capacitor is still in an ultra-low temperature condition, and the capacitance value of the aluminum electrolytic capacitor has not yet recovered to the level required for normal air conditioner start-up. Then, the duration of the injected current is extended. Since the aluminum electrolytic capacitor has an equivalent internal resistance, when the current flows through the aluminum electrolytic capacitor, the aluminum electrolytic capacitor generates heat, causing the body temperature of the aluminum electrolytic capacitor to rise, thereby enabling the capacitance value of the aluminum electrolytic capacitor to recover to the level required for normal air conditioner start-up. If the surface temperature of the aluminum electrolytic capacitor is higher than the third preset temperature, it indicates that the current capacitance value of the aluminum electrolytic capacitor meets the level required for normal air conditioner start-up. Then, the electrical load is started according to the start command.

[0114] By installing a capacitor temperature sensor in the air conditioner, the surface temperature of the aluminum electrolytic capacitor can be directly obtained. The surface temperature of the aluminum electrolytic capacitor is compared with a third preset temperature, and corresponding operations are performed based on the comparison result to ensure that the capacitance value of the aluminum electrolytic capacitor can be increased to the preset value. This ensures that when the electrical load is started according to the start command, the capacitance value of the aluminum electrolytic capacitor is restored to the level required for normal air conditioner startup, thus preventing damage to the aluminum electrolytic capacitor.

[0115] The following example illustrates in detail the starting method of the air conditioner under low-temperature conditions according to this application.

[0116] Reference Figures 1 to 10As shown, the air conditioner's startup method under low-temperature conditions includes: First, determining whether the air conditioner is in a powered-off or power-off state. If the air conditioner is in a powered-off or power-off state, it is determined that the air conditioner is in a standby initial state. If the air conditioner is not in a powered-off or power-off state, the air conditioner continues to run. When the air conditioner is in a standby initial state, the current ambient temperature T4 is detected, and it is determined whether the current ambient temperature T4 is lower than the low-temperature threshold. In this embodiment, the low-temperature threshold is set to -25℃. When the current ambient temperature T4 is lower than -25℃, the thermistor PTC1 is preheated and the preheated heat is transferred to the aluminum electrolytic capacitor. After waiting for a first preset time t0, the bypass switch is activated, wherein the bypass switch is an RY1 relay. When the current ambient temperature T4 is higher than -25℃, the air conditioner is turned on, and the compressor and fan are started. After the bypass switch is engaged, the current ambient temperature T4, DC load preheating time, and DC load power Pw are positively correlated with the aluminum electrolytic capacitor's body temperature Te. It can be understood that the DC load is the electrical load described in the previous embodiment. In this embodiment, the positive correlation is established through prior experiments, creating a one-to-one correspondence between the current ambient temperature and the aluminum electrolytic capacitor's body temperature, and a temperature lookup table is prepared. Therefore, by obtaining the current ambient temperature, the body temperature of the aluminum electrolytic capacitor can be quickly determined from the temperature lookup table. Then, based on the aluminum electrolytic capacitor's body temperature and the injected current... The DC load power Pw corresponding to the current is determined to have a first preset duration t-heat. Current is then injected into the DC load through the aluminum electrolytic capacitor for the first preset duration t-heat. This process includes: activating the compressor winding heater to preheat the bottom of the compressor and the aluminum electrolytic capacitor for a duration of t1; after t1, determining if the bottom of the compressor is overheated; if so, setting the heating duration t2 of the compressor bottom heating module to 0, and then activating the fan winding heater to preheat the aluminum electrolytic capacitor for a duration of t3; if not, simultaneously activating the compressor bottom heating module and the fan winding for heating. The heating module is a DC electric heating element, which preheats the bottom of the compressor and the aluminum electrolytic capacitor for a duration of t2, while the fan winding preheats the aluminum electrolytic capacitor for a duration of t3.

[0117] It is understood that in this embodiment, the first preset duration t-heat of injecting current into the DC load through the aluminum electrolytic capacitor is the sum of the preheating duration t1 of the bottom of the compressor and the aluminum electrolytic capacitor, the heating duration t2 of the heating module at the bottom of the compressor, and the preheating duration t3 of the fan winding heating to the aluminum electrolytic capacitor. The continuous preheating time t-set of the aluminum electrolytic capacitor is the sum of the preheating time t0 of the thermistor PTC1 to the aluminum electrolytic capacitor and the first preset duration t-heat of injecting current into the DC load through the aluminum electrolytic capacitor. When the preheating time of the aluminum electrolytic capacitor reaches the continuous preheating time t-set of the aluminum electrolytic capacitor, it enters the standby state and starts the electrical load according to the start command.

[0118] like Figure 11 As shown, Figure 11 This is a schematic diagram of a node air conditioner 1000 provided in one embodiment of this application.

[0119] The node air conditioner 1000 in this embodiment includes one or more processors 1001 and a memory 1002. Figure 11 The example uses a processor 1001 and a memory 1002.

[0120] Processor 1001 and memory 1002 can be connected via a bus or other means. Figure 11 Taking the example of a connection between China and Israel via a bus.

[0121] Memory 1002, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 1002 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 1002 may optionally include memory 1002 remotely located relative to processor 1001, and these remote memories can be connected to node air conditioner 1000 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0122] Those skilled in the art will understand that Figure 11 The device structure shown does not constitute a limitation on the node air conditioner 1000, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0123] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network nodes. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0124] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0125] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0126] In the several embodiments provided in this application, it should be understood that the disclosed systems, instruments, and methods can be implemented in other ways. For example, the instrument embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between instruments or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0127] It should also be understood that the various implementation methods provided in this application can be combined arbitrarily to achieve different technical effects.

[0128] The above is a detailed description of the preferred embodiments of this application. However, this application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A method for starting an air conditioner under low-temperature conditions, characterized in that, The air conditioner includes an electrical load, which is coupled to the power supply of the air conditioner via an aluminum electrolytic capacitor; the starting method includes: In response to the air conditioner's start command, the current ambient temperature is obtained; If the current ambient temperature is lower than the low temperature threshold, current is injected into the electrical load through the aluminum electrolytic capacitor to raise the temperature of the aluminum electrolytic capacitor. The injected current is less than the normal operating current of the electrical load. After the injected current continues for a first preset duration, the electrical load is started according to the start command.

2. The startup method according to claim 1, characterized in that, The electrical load includes a compressor and a fan; the injection of current into the electrical load through the aluminum electrolytic capacitor includes at least one of the following: The power supply circuit from the aluminum electrolytic capacitor to the compressor is turned on, and a first current is injected into the winding of the compressor for a first duration, wherein the first current is less than the minimum current required for the winding of the compressor to rotate. The power supply circuit from the aluminum electrolytic capacitor to the fan is turned on, and a second current is injected into the fan winding for a second duration. The second current is less than the minimum current required for the fan winding to rotate.

3. The startup method according to claim 2, characterized in that, The electrical load further includes a heating module disposed at the bottom of the compressor; after injecting the first DC current into the windings of the compressor for a first duration, the starting method further includes: Obtain the temperature at the bottom of the compressor; If the temperature at the bottom of the compressor is lower than the first preset temperature, a third current is injected into the heating module for a third duration.

4. The startup method according to claim 1, characterized in that, The air conditioner also includes a thermistor and a bypass switch. The AC input terminal of the air conditioner is coupled to the aluminum electrolytic capacitor through the thermistor. The bypass switch is connected in parallel with the thermistor. Before injecting current into the electrical load through the aluminum electrolytic capacitor, the startup method further includes: Disconnect the bypass switch and energize the circuit containing the thermistor and the aluminum electrolytic capacitor through the AC input terminal of the air conditioner; After the power is applied for a second preset duration, the bypass switch is closed.

5. The startup method according to claim 4, characterized in that, Disconnecting the bypass switch and energizing the circuit containing the thermistor and the aluminum electrolytic capacitor through the AC input terminal of the air conditioner includes: The second preset duration is determined based on the voltage value at the AC input terminal of the air conditioner and the rated capacitance value of the aluminum electrolytic capacitor; Disconnect the bypass switch and disconnect the power supply circuit from the aluminum electrolytic capacitor to the electrical load, and then connect the AC input terminal of the air conditioner for the second preset duration.

6. The startup method according to claim 4, characterized in that, After closing the bypass switch, the startup method further includes: The body temperature of the aluminum electrolytic capacitor is determined based on the current ambient temperature. The first preset duration is determined based on the body temperature of the aluminum electrolytic capacitor and the power corresponding to the injected current.

7. The startup method according to claim 6, characterized in that, The electrical load includes a compressor, a fan, and a heating module located at the bottom of the compressor; the injection of current into the electrical load through the aluminum electrolytic capacitor includes: The fourth, fifth, and sixth currents are determined based on the power corresponding to the injected current, and the fourth, fifth, and sixth durations are determined based on the first preset duration. The power supply circuit from the aluminum electrolytic capacitor to the compressor is turned on, and the fourth current is injected into the winding of the compressor for the fourth duration, wherein the fourth current is less than the minimum current required for the winding of the compressor to rotate; After the fourth time period, the power supply circuit from the aluminum electrolytic capacitor to the compressor is turned off, and the temperature at the bottom of the compressor is obtained; If the temperature at the bottom of the compressor is higher than the second preset temperature, the sixth duration is set to zero; If the temperature at the bottom of the compressor is lower than the second preset temperature, the sixth current is injected into the heating module for the sixth duration. After the sixth duration, the power supply to the heating module is disconnected, the power supply circuit from the aluminum electrolytic capacitor to the fan is turned on, and a fifth current is injected into the fan winding for the fifth duration. The fifth current is less than the minimum current required for the fan winding to rotate.

8. The startup method according to claim 1, characterized in that, After the injected current continues for a first preset duration, the electrical load is started according to the start command, including: After the injected current has been maintained for a first preset time, the surface temperature of the aluminum electrolytic capacitor is obtained. If the surface temperature of the aluminum electrolytic capacitor is lower than the third preset temperature, the duration of the injected current is extended. If the surface temperature of the aluminum electrolytic capacitor is higher than the third preset temperature, the electrical load is started according to the start command.

9. A controller, characterized in that, It includes at least one processor and a memory for communicatively connecting with said at least one processor; The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the startup method as described in any one of claims 1 to 8.

10. An air conditioner, characterized in that, Includes the controller as described in claim 9.

Images