Control device and control method of air conditioner, equipment and storage medium

Abstract

The invention discloses a control device and method of an air conditioner, equipment and a storage medium. The control device comprises a controller, a rectifying circuit, a switching power supply circuit and a first energy storage unit, and the controller is used for controlling at least one valve body to act and supplying power to the at least one valve body; the rectified power is used for rectifying an external power supply into direct current; the switching power supply circuit is used for converting the direct current output by the rectifying circuit and then supplying power to the controller; the first energy storage unit is arranged at the output end of the rectifying circuit, connected with the power supply end of the switching power supply circuit and used for storing the electric energy output by the rectifying circuit and supplying power to the switching power supply circuit when the external power supply is powered off. Under the condition that the external power supply is suddenly powered off, the first energy storage unit supplies power to the switching power supply circuit, the controller continues to work, the valve body can be controlled to be completely closed, and the safety and reliability of the air conditioner are improved.

Description

Technical Field

[0001] The present application relates to the field of air conditioners, and particularly to a control device for an air conditioner, a control method therefor, a device, and a storage medium. Background Art

[0002] An electric valve is usually used in an air conditioner to control the opening degree, flow path truncation, and opening of the electric valve by sending a pulse signal or turning the power supply on and off. Before the air conditioner stops running, the electric valve will be controlled to be in a set state.

[0003] In related technologies, when the external power supply of the air conditioner suddenly cuts off, the controller of the air conditioner no longer controls the electric valve, and the electric valve maintains the opening state before power-off until the next power-on. If there is a leak in the indoor unit of the air conditioner, since the electric valve maintains the current opening state, the refrigerant in the refrigerant pipeline will leak into the surrounding environment of the air conditioner through the electric valve, and some types of refrigerants are flammable, posing a safety hazard. Summary of the Invention

[0004] In view of this, embodiments of the present application provide a control device for an air conditioner, a control method therefor, a device, and a storage medium, aiming to control the valve body to be in a fully closed state when the external power supply of the air conditioner suddenly cuts off, improving the safety and reliability of the air conditioner.

[0005] The technical solution of the embodiments of the present application is implemented as follows:

[0006] In a first aspect, embodiments of the present application provide a control device for an air conditioner. At least one valve body is provided on the refrigerant pipeline of the air conditioner, including:

[0007] A controller for controlling the at least one valve body to act and supplying power to the at least one valve body;

[0008] A rectifier circuit for rectifying the external power supply into direct current;

[0009] A switching power supply circuit for converting and processing the direct current output by the rectifier circuit and supplying power to the controller;

[0010] A first energy storage unit is provided at the output end of the rectifier circuit and is connected to the power supply end of the switching power supply circuit, for storing the electric energy output by the rectifier circuit and supplying power to the switching power supply circuit when the external power supply cuts off.

[0011] In some embodiments, the air conditioner further includes an inverter circuit for supplying power to a three-phase load, and the control device further includes:

[0012] A second energy storage unit is disposed at the output end of the rectifier circuit and connected to the input end of the inverter circuit, and is configured to store the electric energy output by the rectifier circuit and supply power to the inverter circuit and the switching power supply circuit when the external power supply is powered off.

[0013] In some embodiments, the control device further includes:

[0014] A first diode is disposed between the input end of the inverter circuit and the first energy storage unit. The anode of the first diode is connected to the input end of the inverter circuit, and the cathode of the first diode is connected to the first energy storage unit, and is configured to cut off the power supply from the first energy storage unit to the inverter circuit when the external power supply is powered off.

[0015] In some embodiments, the control device further includes:

[0016] A first thermistor is disposed between the anode of the first diode and the input end of the inverter circuit, and is configured to limit the charging current of the rectifier circuit supplying power to the first energy storage unit; and / or, a second thermistor is disposed between the power supply end of the rectifier circuit and the power supply port of the air conditioner, and is configured to limit the charging current of the rectifier circuit supplying power to the first energy storage unit and the second energy storage unit;

[0017] Wherein, the power supply port of the air conditioner is configured to connect to the external power supply.

[0018] In some embodiments, the first energy storage unit is further configured to perform filtering and voltage stabilization processing on the output power supply of the rectifier circuit when the external power supply is normally powered.

[0019] In some embodiments, the control device further includes:

[0020] A voltage detection circuit is configured to detect the power supply state of the external power supply, generate first power supply detection information indicating that the external power supply is normally powered, and send the first power supply detection information to the controller.

[0021] In some embodiments, the first energy storage unit is further configured to supply power to the switching power supply circuit at an output voltage greater than or equal to a first set voltage threshold within a first set time period when the external power supply is powered off;

[0022] Wherein, the first set time period is greater than or equal to the time period required for the controller to control the at least one valve body to change from the fully open state to the fully closed state;

[0023] The first set voltage threshold is the lower limit value of the operating voltage allowed by the switching power supply circuit.

[0024] In some embodiments, the first energy storage unit and the controller are disposed on the same substrate.

[0025] In some embodiments, the first energy storage unit includes: an electrolytic capacitor; the second energy storage unit includes: an electrolytic capacitor.

[0026] Second, an embodiment of the present application provides a control method for a control device of an air conditioner as described in the first aspect of the embodiments of the present application. The method includes:

[0027] Determine that the external power supply is powered off;

[0028] Control the at least one valve body to close to a fully closed state.

[0029] In some embodiments, the control method further includes:

[0030] After controlling the at least one valve body to close for a first set duration, the controller shuts down and cuts off the power;

[0031] Wherein, the first set duration is greater than or equal to the duration required for the controller to control the at least one valve body from a fully open state to a fully closed state.

[0032] In some embodiments, the determining that the external power supply is powered off includes:

[0033] If the first power detection information is not received within a second set duration, it is determined that the external power supply is powered off;

[0034] Wherein, the first power detection information is generated by a voltage detection circuit of the control device and is used to characterize that the external power supply is normally powered.

[0035] Third, an embodiment of the present application provides a control device of an air conditioner as described in one aspect of the embodiments of the present application. The controller is configured to execute the steps of the method described in the second aspect of the embodiments of the present application.

[0036] Fourth, an embodiment of the present application provides an electronic device. The electronic device is an air conditioner and includes: at least one valve body and the control device as described in the third aspect.

[0037] Fifth, an embodiment of the present application provides a storage medium. A computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the method described in the second aspect of the embodiments of the present application are implemented.

[0038] The control device of the air conditioner provided by the embodiment of the present application includes: a controller for controlling at least one valve body to act and supplying power to at least one valve body; a rectifier circuit for rectifying an external power supply into direct current; a switching power supply circuit for converting and processing the direct current output by the rectifier circuit and supplying power to the controller; a first energy storage unit arranged at the output end of the rectifier circuit and connected to the power supply end of the switching power supply circuit, for storing the electric energy output by the rectifier circuit and supplying power to the switching power supply circuit when the external power supply is cut off. Based on the connection of the first energy storage unit with the rectifier circuit and the switching power supply circuit, the charging and discharging functions of the first energy storage unit are realized. In the case of a sudden power failure of the external power supply, the first energy storage unit supplies power to the switching power supply circuit, and the controller continues to work, and can control the valve body to be completely closed, effectively avoiding the leakage of combustible refrigerant to the surrounding environment where the air conditioner is located through the leakage point, and improving the safety and reliability of the air conditioner. Description of the Drawings

[0039] Figure 1 It is a schematic structural diagram of the control device of the air conditioner according to the embodiment of the present application;

[0040] Figure 2 It is a schematic structural diagram of the air conditioner in an application example of the present application;

[0041] Figure 3 It is a schematic structural diagram of the control device of the air conditioner in an application example of the present application;

[0042] Figure 4 It is a schematic structural diagram of the control device of the air conditioner in an application example of the present application;

[0043] Figure 5 It is a schematic structural diagram of the control device of the air conditioner in an application example of the present application;

[0044] Figure 6 It is a schematic structural diagram of the control device of the air conditioner in an application example of the present application;

[0045] Figure 7 It is a schematic structural diagram of the control device of the air conditioner in an application example of the present application;

[0046] Figure 8 It is a schematic circuit diagram of the control device of the air conditioner in an application example of the present application;

[0047] Figure 9 It is a schematic flow diagram of the control method of the control device according to the embodiment of the present application;

[0048] Figure 10 It is a schematic circuit diagram of the voltage detection circuit in an application example of the present application;

[0049] Figure 11Waveform schematic diagram of the first power detection information in an application example of the present application;

[0050] Figure 12 Flow schematic diagram of the control method of the control device in an application example of the present application when the external power supply suddenly cuts off. Detailed implementation manners

[0051] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0053] The embodiment of the present application provides a control device for an air conditioner. As Figure 1 shown, at least one valve body 500 is provided on the refrigerant pipeline of the air conditioner. The control device includes: a controller 100, a rectifier circuit 200, a switching power supply circuit 300, and a first energy storage unit 400. The controller 100 is used to control the action of at least one valve body 500 and supply power to at least one valve body 500. The rectifier circuit 200 is used to rectify the external power supply 600 into direct current. The switching power supply circuit 300 is used to convert and process the direct current output by the rectifier circuit 200 and supply power to the controller 100. The first energy storage unit 400 is arranged at the output end of the rectifier circuit 200 and connected to the power supply end of the switching power supply circuit 300, and is used to store the electric energy output by the rectifier circuit 200 and supply power to the switching power supply circuit 300 when the external power supply 600 cuts off.

[0054] Here, the refrigerant is used to transfer heat energy in the air conditioner to produce a refrigeration or heating effect; the refrigerant pipeline connects the indoor unit and the outdoor unit of the air conditioner and is used for the circulation of the refrigerant; the valve body 500 controls the refrigerant flow rate in the refrigerant pipeline by adjusting the opening degree to produce different refrigeration or heating effects.

[0055] Among them, the valve body 500 can be an electric valve, and the embodiment of the present application does not make a specific limitation on the type of the valve body 500; the air conditioner includes at least one valve body 500, and the number of the valve bodies 500 can be determined according to the number of the refrigerant pipelines.

[0056] In addition, the air conditioner can also be provided with two valve bodies 500 on the main return pipeline of the refrigerant pipeline. When the controller 100 controls the two valve bodies 500 to be closed to the fully closed state, all the refrigerant pipelines are in a cut-off state.

[0057] In an application example of the present application, a structural schematic diagram of an air conditioner is provided. As Figure 2As shown in the figure. The outdoor unit of the air conditioner includes components such as an outdoor heat exchanger, a gas-liquid separator, a compressor, a check valve, and a four-way valve. A refrigerant pipeline is provided between the indoor unit and the outdoor unit of the air conditioner. An electric valve is provided on each branch of the refrigerant pipeline to control the refrigerant flow in the branch of the refrigerant pipeline. An electric valve is provided on each of the inlet side and the outlet side of the main circuit of the refrigerant pipeline to cut off the refrigerant flow in the refrigerant pipeline.

[0058] It can be understood that when the controller 100 controls all the electric valves on the branch of the refrigerant pipeline to be closed to the fully closed state, or controls the two electric valves on the main circuit of the refrigerant pipeline to be closed to the fully closed state, all the refrigerant pipelines can be in the cut-off state.

[0059] It should be noted that when the controller 100 of the air conditioner receives an external shutdown instruction, the controller 100 will sequentially shut down the various working components of the air conditioner according to the set shutdown steps. When all the shutdown steps are completed, the controller 100 executes the power-off step. At this time, the air conditioner loses the control power supply and is in the shutdown and power-off state.

[0060] Among them, the set shutdown steps include that the controller 100 controls the valve body 500 to be in the set state.

[0061] It should be noted that in the related art, when the external power supply of the air conditioner suddenly cuts off, the controller loses the input power supply and cannot execute the shutdown steps before power-off. The controller no longer controls the opening of the valve body, and the valve body remains in the opening state before power-off until the next power-on. For example, if there is a leak in the indoor unit of the air conditioner, since the valve body remains in the current opening state, the refrigerant in the refrigerant pipeline will leak through the leak point and through the valve body into the surrounding environment where the air conditioner is located, posing a safety hazard; when the refrigerant is flammable, an explosion may even occur.

[0062] It can be understood that in the first embodiment of the present application, the first energy storage unit 400 is connected to the switching power supply circuit 300. In the case of a sudden power-off of the external power supply 600, the first energy storage unit 400 supplies power to the switching power supply circuit 300, and the controller 100 can continue to work and can control the valve body 500 to be completely closed, effectively avoiding the leakage of flammable refrigerant through the leak point and through the valve body 500 into the surrounding environment where the air conditioner is located when there is a leak in the indoor unit of the air conditioner, improving the safety and reliability of the air conditioner.

[0063] Exemplarily, as Figure 3 shown, the air conditioner further includes an inverter circuit 800 for supplying power to a three-phase load, and the control device further includes a second energy storage unit 700. The second energy storage unit 700 is arranged at the output end of the rectifier circuit 200 and is connected to the input end of the inverter circuit 800, and is used to store the electric energy output by the rectifier circuit 200 and supply power to the inverter circuit 800 and the switching power supply circuit 300 when the external power supply 600 is powered off.

[0064] It should be noted that when the external power supply 600 supplies power normally, the rectifier circuit 200 supplies power not only to the switching power supply circuit 300 but also to the inverter circuit 800.

[0065] Here, the inverter 800 is used to invert the direct current output by the rectifier circuit 200 into alternating current and supply it to the three-phase load of the air conditioner.

[0066] It can be understood that when the external power supply 600 is powered off, the rectifier circuit 200 stops outputting. Since the second energy storage unit 700 is connected to the input end of the inverter circuit 800, at this time, the second energy storage unit 700 discharges, and the inverter circuit 800 continues to operate. After the controller 100 controls the three-phase load of the air conditioner to stop, the inverter circuit 800 stops working.

[0067] It can be understood that when the external power supply 600 is powered off and the output voltage of the first energy storage unit 400 is less than or equal to the output voltage of the second energy storage unit 700, the second energy storage unit 700 supplies power to the switching power supply circuit 300.

[0068] It can be understood that due to the relatively large power of the three-phase load of the air conditioner, the second energy storage unit 700 needs to supply emergency power to the inverter circuit 800 when the external power supply 600 is powered off, and the capacity of the second energy storage unit 700 is greater than that of the first energy storage unit 400.

[0069] Exemplarily, as Figure 4 shown, the control device further includes a first diode 900. The first diode 900 is disposed between the input end of the inverter circuit 800 and the first energy storage unit 400. The anode of the first diode 900 is connected to the input end of the inverter circuit 800, and the cathode of the first diode 900 is connected to the first energy storage unit 400, and is used to cut off the power supply from the first energy storage unit 400 to the inverter circuit 800 when the external power supply 600 is powered off.

[0070] It can be understood that due to the relatively large power of the three-phase load of the air conditioner, when the external power supply 600 is powered off, the second energy storage unit 700 supplies power to the inverter circuit 800 for the three-phase load to execute the shutdown procedure, and the electric energy stored in the second energy storage unit 700 is consumed relatively quickly. When the output voltage of the second energy storage unit 700 is less than the output voltage of the first energy storage unit 400, the first energy storage unit 400 supplies power to the three-phase load of the air conditioner, and the electric energy stored in the first energy storage unit 400 is quickly consumed, and it is impossible to ensure that the controller 100 controls at least one valve body 500 to close to the fully closed state.

[0071] It can be understood that a first diode 900 is provided between the input end of the inverter circuit 800 and the first energy storage unit 400. By using the principle of reverse cut-off of the diode, the power supply from the first energy storage unit 400 to the inverter circuit 800 is cut off, so that the first energy storage unit 400 discharges slowly, ensuring that the controller 100 controls at least one valve body 500 to be closed to the fully closed state, and the circuit for the second energy storage unit 700 to supply power to the switching power supply circuit 300 is unidirectional conductive.

[0072] Exemplarily, as Figure 5 shown, the control device further includes: a first thermistor 1000 and / or a second thermistor 1100. The first thermistor 1000 is disposed between the anode of the first diode 900 and the input end of the inverter circuit 800, and is used to limit the charging current of the rectifier circuit 200 supplying power to the first energy storage unit 400. The second thermistor 1100 is disposed between the power supply end of the rectifier circuit 200 and the power supply port of the air conditioner, and is used to limit the charging current of the rectifier circuit 200 supplying power to the first energy storage unit 400 and the second energy storage unit 700. Wherein, the power supply port of the air conditioner is used to connect to an external power supply 600.

[0073] Here, the power supply port of the air conditioner may be a three-phase plug of the air conditioner.

[0074] Here, the first thermistor 1000 and the second thermistor 1100 are positive temperature coefficient resistors. A positive temperature coefficient resistor is a typical semiconductor resistor with temperature sensitivity. When the temperature exceeds the Curie temperature, the resistance value of the positive temperature coefficient resistor increases stepwise with the increase of temperature. The higher the temperature, the larger the resistance value.

[0075] It should be noted that the positive temperature coefficient resistor is usually used as a current limiting protection device in series in the circuit. When the circuit is working normally, the temperature of the positive temperature coefficient resistor is close to the working environment temperature. At this time, the resistance value of the positive temperature coefficient resistor is small and will not hinder the passage of current. When the current in the circuit is too large, the temperature of the positive temperature coefficient resistor rises due to the increase of power. When the temperature exceeds the Curie temperature, the resistance value of the positive temperature coefficient resistor will increase stepwise, and the current in the circuit will quickly decrease to the safe current value. At this time, the power of the positive temperature coefficient resistor decreases, and the resistance value of the positive temperature coefficient resistor decreases stepwise, and the circuit resumes normal operation.

[0076] It can be understood that the first thermistor 1000 and the second thermistor 1100 are used to limit the charging current during the charging processes of the first energy storage unit 400 and the second energy storage unit 700. If the control device does not provide the first thermistor 1000 and the second thermistor 1100, during the power-on stage of the air conditioner, due to the large potential difference across the rectifier circuit 200, the charging start currents of the first energy storage unit 400 and the second energy storage unit 700 will increase rapidly, easily causing an overcurrent fault in the control device.

[0077] In an application example of the present application, as Figure 6 shown, the control device further includes a pre-charge relay S1. The pre-charge relay S1 is connected in parallel with the second thermistor 1100, and the main contact of the pre-charge relay S1 is connected to the power supply terminal of the rectifier circuit 200.

[0078] It should be noted that the pre-charge relay S1 is a normally open relay. When the voltage of the second energy storage unit 700 reaches a preset voltage value, the controller 100 controls the main contact of the pre-charge relay S1 to close, and the external power supply 600 supplies power to the switching power supply circuit 300 and the inverter circuit 800 through the rectifier circuit 200.

[0079] It can be understood that during the operation stage of the air conditioner, the three-phase load of the air conditioner starts, the input current of the rectifier circuit 200 is large, and the heating power and resistance value of the second thermistor 1100 increase accordingly. At this time, the second thermistor 1100 will cause excessive heat loss. The control device in an application example of the present application adds a pre-charge relay S1 connected in parallel with the second thermistor 1100. The second thermistor 1100 only conducts current during the pre-charging stage of the rectifier circuit 200 for the first energy storage unit 400 and the second energy storage unit 700. After the main contact of the pre-charge relay S1 closes, it becomes a bypass of the second thermistor 1100, reducing the heat loss of the control device during the operation stage of the air conditioner.

[0080] In an application example of the present application, the control device may only provide the second thermistor 1100 and not provide the first thermistor 1000. Since the second thermistor 1100 is connected to the power supply terminal of the rectifier circuit 200, during the charging process of the rectifier circuit 200 for the first energy storage unit 400, the charging current of the first energy storage unit 400 can still be limited.

[0081] Exemplarily, the first energy storage unit 400 is further used to filter and regulate the output power supply of the rectifier circuit 200 when the external power supply 600 supplies power normally.

[0082] It can be understood that the charging and discharging processes of the first energy storage unit 400 require a certain duration, and the voltage change of the first energy storage unit 400 is relatively slow. When the output voltage of the rectifier circuit 200 changes suddenly, the first energy storage unit 400 will charge or discharge according to the change of the output voltage of the rectifier circuit 200 to ensure the smooth and stable supply voltage of the switching power supply circuit 300.

[0083] It can be understood that when the external power supply 600 supplies power normally, the second energy storage unit 700 also filters and stabilizes the output power of the rectifier circuit 200.

[0084] Exemplarily, as Figure 7 shown, the control device further includes: a voltage detection circuit 1200. The voltage detection circuit 1200 is used to detect the power supply state of the external power supply 600, generate first power detection information indicating that the external power supply 600 supplies power normally, and send the first power detection information to the controller 100.

[0085] It can be understood that the controller 100 determines whether the external power supply 600 supplies power normally according to the first power detection information sent by the voltage detection circuit 1200. The embodiments of the present application do not specifically limit the manner in which the voltage detection circuit 1200 detects the power supply state of the external power supply 600.

[0086] Exemplarily, the first energy storage unit 400 is further configured to supply power to the switching power supply circuit 300 with an output voltage greater than or equal to a first set voltage threshold within a first set duration when the external power supply 600 is powered off. The first set duration is greater than or equal to the duration required for the controller 100 to control at least one valve body 500 from the fully open state to the fully closed state. The first set voltage threshold is the lower limit value of the allowable operating voltage of the switching power supply circuit 300.

[0087] It should be noted that when the controller 100 executes the valve closing instruction, it usually only controls at least one valve body 500 to perform the closing action and does not detect the current opening degree of at least one valve body 500. Since the first set duration is greater than or equal to the duration required for the controller 100 to control the valve body 500 from the fully open state to the fully closed state, when the controller 100 executes the control valve body 500 closing action for the first set duration, it can be indirectly determined that the valve body 500 is in the fully closed state at this time.

[0088] It can be understood that when the external power supply 600 is powered off, the rectifier circuit 200 cannot supply power to the switching power supply circuit 300, and the controller 100 cannot continue to operate. At this time, the electric energy stored in the first energy storage unit 400 and the second energy storage unit 700 can supply power to the switching power supply circuit 300. To ensure that the controller 100 can control at least one valve body 400 to close to the fully closed state, the first energy storage unit 400 and the second energy storage unit 700 supply power to the switching power supply circuit 300 for at least the first set duration.

[0089] It can be understood that the first set voltage threshold is the lower limit of the allowable operating voltage of the switching power supply circuit 300. When the output voltage of the first energy storage unit 400 is greater than or equal to the first set voltage threshold, it can ensure the normal operation of the switching power supply circuit 300; when the output voltage of the first energy storage unit 400 is less than the first set voltage threshold, it cannot ensure the normal operation of the switching power supply circuit 300.

[0090] It should be noted that when the external power supply 700 is powered off, the second energy storage unit 700 needs to supply power to the inverter circuit 800. During the valve closing step executed by the controller 100, the output voltage of the second energy storage unit 700 may be less than the output voltage of the first energy storage unit 400, and the second energy storage unit 700 cannot supply power to the switching power supply circuit 300. Therefore, the capacity of the first energy storage unit 400 needs to ensure that after discharging for the first set duration, the output voltage of the first energy storage unit 400 is greater than or equal to the first set voltage threshold, that is, the output voltage of the first energy storage unit 400 can ensure that the controller 100 controls at least one valve body 400 to close to the fully closed state within the first set duration.

[0091] Here, the lower limit of the allowable operating voltage of the switching power supply circuit 300 can be obtained from the technical specification manual provided by the manufacturer of the switching power supply circuit 300.

[0092] Exemplarily, the first energy storage unit 400, the second energy storage unit 700, and the controller 100 are arranged on the same substrate.

[0093] It can be understood that the first energy storage unit 400 and the second energy storage unit 700 are arranged on the DC bus at the output end of the rectifier circuit 200, and can supply power to the switching power supply circuit 300 without setting a voltage transformation circuit. The circuit design of the control device is simple. The first energy storage unit 400, the second energy storage unit 700, and the controller 100 are arranged on the same substrate, saving the cost of the control device.

[0094] Exemplarily, the first energy storage unit 400 includes: electrolytic capacitors. The second energy storage unit 700 includes: electrolytic capacitors.

[0095] Here, the positive electrode of the electrolytic capacitor is a metal foil, and the main component of the negative electrode is an electrolyte. The electrolytic capacitor has a large capacitance per unit volume, which can meet the power supply requirements of the switching power supply circuit 300 and the inverter circuit 800, and there is no need to set up a Battery Management System to control the charging and discharging functions of the first energy storage unit 400 and the second energy storage unit 700.

[0096] In an application example of the present application, a circuit schematic diagram of a control device is provided, as Figure 8 shown. The external power supply 600 is an AC power supply, the first energy storage unit 400 is an electrolytic capacitor E1, the second energy storage unit 700 is an electrolytic capacitor E2, the first thermistor PTC1 is arranged on the branch of the switching power supply circuit 300, and the diodes D1 - D4 together form a rectifier circuit 200. The working mode of the switching power supply circuit 300 is controlled by the integrated circuit IC1. During the power-on stage of the air conditioner, the output current of the external power supply 600 enters the rectifier circuit 200 through the second thermistor PTC2, and after rectification, it charges the electrolytic capacitors E1 and E2. Since the voltages of E1 and E2 change slowly at this time, the voltage between the DC bus P and N is pulled down. When the voltage between the DC bus P and N reaches the first preset voltage threshold, the switching power supply circuit 300 starts to work, and the controller 100 runs. When the voltage between the DC bus P and N reaches the preset voltage value, the controller 100 controls the pre-charge relay S1 to close and controls the inverter circuit 800 to work, starting the three-phase load of the air conditioner. At this time, the electrolytic capacitors E1 and E2 act as support capacitors of the control device, playing a role in filtering and voltage stabilization. When the voltage detection circuit 1200 detects that the external power supply 600 is powered off, the electrolytic capacitor E2 supplies power to the inverter circuit 800 and the switching power supply circuit 300. Due to the reverse cut-off function of the first diode D1, the electrolytic capacitor E1 only supplies power to the switching power supply circuit 300, and at this time, the controller 100 controls the valve body 500 to close.

[0097] The embodiment of the present application also provides a control method based on the foregoing control device, as Figure 9 shown. The method includes:

[0098] Step 901, determining that the external power supply is powered off.

[0099] Step 902, controlling at least one valve body to close to the fully closed state.

[0100] It can be understood that for the control method of the embodiments of the present application, on the premise that the controller 100 does not receive an external shutdown instruction, by determining that the external power supply 600 is powered off and judging that the output voltage of the switching power supply circuit 300 will soon be unable to ensure the normal operation of the controller 100, the controller 100 executes the shutdown procedure, controls the valve body 500 to close to the fully closed state, effectively avoiding the situation that the controller 100 is unable to control the opening degree of the valve body 500 due to the sudden power-off of the external power supply 600, and further eliminating the leakage of combustible refrigerant to the surrounding environment where the air conditioner is located through the leak point via the valve body 500 when there is a leak in the indoor unit of the air conditioner, thus improving the safety and reliability of the air conditioner.

[0101] It can be understood that after the external power supply 600 is powered off, the first energy storage unit 400 no longer charges, and the first energy storage unit 400 supplies power to the switching power supply circuit 300.

[0102] It should be noted that the first energy storage unit 400 can be an electrolytic capacitor. When the output voltage of the rectification circuit 200 is less than the voltage of the first energy storage unit 400, the first energy storage unit 400 directly supplies power to the switching power supply circuit 300 without control.

[0103] In an application example of the present application, after step 901, the control method further includes: stopping the compressor and the outdoor unit DC fan.

[0104] Here, in addition to controlling the opening degree of the valve body 500, the controller 100 of the control device can also control the start and stop of the compressor and the outdoor unit DC fan of the air conditioner.

[0105] Exemplarily, after step 902, the control method further includes: after controlling at least one valve body to close for a first set duration, the controller shuts down and cuts off the power. Wherein, the first set duration is greater than or equal to the duration required for the controller to control at least one valve body from the fully open state to the fully closed state.

[0106] It can be understood that when the controller 100 determines that the external power supply 600 is powered off, the controller 100 controls the valve body 500 to close to the fully closed state. Since the controller 100 cannot directly detect the current opening degree of the valve body 500, the controller 100 controls the valve body 500 to close for a first set duration, where the first set duration is greater than or equal to the duration required for the controller 100 to control the valve body 500 from the fully open state to the fully closed state, and it can be indirectly determined that the valve body 500 is currently in the fully closed state. At this time, the controller 100 has completed all the set shutdown steps, the air conditioner does not need to be powered on for operation, and the controller 500 executes the power-off step.

[0107] Exemplarily, determining that the external power supply is powered off includes: if the first power detection information is not received within the second set duration, it is determined that the external power supply is powered off. The first power detection information is generated by the voltage detection circuit of the control device and is used to characterize that the external power supply is powered normally.

[0108] Here, in an application example of the present application, the voltage detection circuit 1200 may be an optocoupler voltage detection circuit. As Figure 10 shown, the external power supply 600 is connected to the optocoupler IC101 through the diode D101 and the high-power resistor R101. The high-power resistor R102, the capacitor C101, and the Schottky diode D102 play a voltage stabilization and protection role. And the optocoupler IC101 conducts during the positive half-cycle of the output voltage of the external power supply 600 and cuts off during the negative half-cycle of the output voltage of the external power supply 600; the control power supply is grounded through the capacitor C102. The output end of the optocoupler is connected to the pull-up resistor R103 and the high-power resistor R104. When the optocoupler IC101 conducts, the controller 100 receives a low-level signal, and when the optocoupler IC101 cuts off, the controller 100 receives a high-level signal.

[0109] Figure 11 is a waveform schematic diagram of the first power detection information in an application example of the present application.

[0110] It can be understood that the first power detection information may be a low-level signal generated by the voltage detection circuit 1200. When the external power supply 600 is powered normally, the controller 100 will periodically receive a low-level signal according to the frequency of the output voltage of the external power supply 600. If the controller 100 does not receive the low-level signal sent by the voltage detection circuit 1200 within the second set duration, it is determined that the external power supply 600 is powered off.

[0111] It can be understood that the second set duration is greater than or equal to one cycle of the output voltage of the external power supply 600. When the external power supply 600 is powered normally, within half of the second set duration, the controller 100 receives the low-level signal sent by the voltage detection circuit 1200, and within the other half of the second set duration, the controller 100 receives the high-level signal sent by the voltage detection circuit 1200.

[0112] In an application example of the present application, a control method of the control device when the external power supply suddenly powers off is provided. As Figure 12 shown, it includes:

[0113] Step 1201, the external power supply is powered off.

[0114] Here, the power-off of the external power supply 600 may be that the external power supply 600 suddenly loses power, or the power plug of the air conditioner suddenly falls off from the socket.

[0115] Step 1202: Determine that the external power supply is powered off.

[0116] Here, it can be determined that the external power supply 600 is powered off according to the fact that the controller 100 does not receive the first power detection information within the second set duration. Among them, the first power detection information can be a low-level signal periodically sent by the voltage detection circuit 1200, and the second set duration is greater than or equal to one cycle of the output voltage of the external power supply 600.

[0117] Step 1203: The first energy storage unit and the second energy storage unit discharge.

[0118] Here, due to the external power supply 600, the output voltage of the rectifier circuit 200 will soon be unable to ensure the normal operation of the air conditioner. The first energy storage unit 400 and the second energy storage unit 700 no longer charge. When the rectifier circuit 200 is lower than the voltages of the first energy storage unit 400 and the second energy storage unit 700, the first energy storage unit 400 and the second energy storage unit 700 discharge. The first energy storage unit 400 supplies power to the switching power supply circuit 300, and the second energy storage unit 700 supplies power to the switching power supply circuit 300 and the inverter circuit 800.

[0119] Step 1204: Stop the compressor and the outdoor unit DC fan.

[0120] Here, in addition to controlling the opening degree of the valve body 500, the controller 100 of the control device can also control the start and stop of the compressor and the outdoor unit DC fan of the air conditioner.

[0121] Step 1205: Control the valve body to close to the fully closed state.

[0122] Step 1206: The controller shuts down and cuts off the power.

[0123] Here, after the controller 100 determines that the valve body 500 is all in the fully closed state, it determines that all the shutdown steps have been completed, and the controller 100 shuts down and cuts off the power.

[0124] Here, it can start timing from the start of the control action of the controller 100 to close the valve body 500. After reaching the first set duration, the controller 100 determines that the valve body 500 is all in the fully closed state. Among them, the first set duration is greater than or equal to the duration required for the controller 100 to control at least one valve body 500 from the fully open state to the fully closed state.

[0125] Step 1207: The first energy storage unit and the second energy storage unit finish discharging.

[0126] Here, after the controller 100 shuts down and cuts off the power supply, the air conditioner is in a shutdown state, and the first energy storage unit 400 and the second energy storage unit 700 release their respective remaining power to the outside. Among them, the remaining power of the first energy storage unit 400 and the second energy storage unit 700 can be actively and quickly released through a fast discharge circuit including a large-value resistor, or can be passively and slowly released.

[0127] It can be understood that any step of the control method of the control device in the foregoing embodiments of the present application can be implemented by a configuration program of the controller 100 of the control device.

[0128] The embodiments of the present application further provide an electronic device, which is an air conditioner. The electronic device includes at least one valve body 500 and the control device described in the foregoing embodiments of the present application. In this way, when the external power supply 600 suddenly loses power without the controller 100 receiving an external shutdown instruction, the first energy storage unit 400 supplies power to the switching power supply circuit 300, and the controller 100 continues to work, and can control the valve body 500 to be completely closed, effectively avoiding the leakage of combustible refrigerant into the surrounding environment where the air conditioner is located through the leakage point and the valve body 500 when there is a leakage point in the indoor unit of the air conditioner, improving the safety and reliability of the air conditioner.

[0129] In an exemplary embodiment, the embodiments of the present application further provide a storage medium, that is, a computer storage medium, specifically a computer-readable storage medium, for example, a memory including a stored computer program. The foregoing computer program can be executed by a microprocessor of the control device to complete the steps described in the method of the embodiments of the present application. The computer-readable storage medium can be a read-only memory (ROM, Read Only Memory), a programmable read-only memory (PROM, Programmable Read-Only Memory), an erasable programmable read-only memory (EPROM, Erasable Programmable Read-Only Memory), an electrically erasable programmable read-only memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), a ferromagnetic random access memory (FRAM, ferromagnetic random access memory), a flash memory (Flash Memory), a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM, Compact Disc Read-Only Memory); the magnetic surface memory can be a disk memory or a tape memory.

[0130] It should be noted that: "first", "second", etc. are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence.

[0131] In addition, the technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.

[0132] As mentioned above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A control device for an air conditioner, characterized in that, at least one valve body is provided on the refrigerant pipeline of the air conditioner, and the control device includes: a controller for controlling the operation of the at least one valve body and supplying power to the at least one valve body; a rectification circuit for rectifying an external power supply into direct current; a switching power supply circuit for converting and processing the direct current output by the rectification circuit and supplying power to the controller; a first energy storage unit provided at the output end of the rectification circuit and connected to the power supply end of the switching power supply circuit, for storing the electric energy output by the rectification circuit and supplying power to the switching power supply circuit when the external power supply is cut off.

2. The control device according to claim 1, characterized in that, the air conditioner further includes an inverter circuit for supplying power to a three-phase load, and the control device further includes: a second energy storage unit provided at the output end of the rectification circuit and connected to the input end of the inverter circuit, for storing the electric energy output by the rectification circuit and supplying power to the inverter circuit and the switching power supply circuit when the external power supply is cut off.

3. The control device according to claim 2, characterized in that, the control device further includes: a first diode provided between the input end of the inverter circuit and the first energy storage unit, the anode of the first diode is connected to the input end of the inverter circuit, and the cathode of the first diode is connected to the first energy storage unit, for cutting off the power supply of the first energy storage unit to the inverter circuit when the external power supply is cut off.

4. The control device according to claim 3, characterized in that, the control device further includes: a first thermistor provided between the anode of the first diode and the input end of the inverter circuit, for limiting the charging current of the rectification circuit supplying power to the first energy storage unit; and / or, a second thermistor provided between the power supply end of the rectification circuit and the power supply port of the air conditioner, for limiting the charging current of the rectification circuit supplying power to the first energy storage unit and the second energy storage unit; wherein, the power supply port of the air conditioner is used to connect to the external power supply.

5. The control device according to claim 1, characterized in that, the first energy storage unit is further used for filtering and stabilizing the output power of the rectification circuit when the external power supply is normally supplying power.

6. The control device according to claim 1, characterized in that, the control device further includes: a voltage detection circuit for detecting the power supply state of the external power supply, generating first power detection information indicating that the external power supply is supplying power normally, and sending the first power detection information to the controller.

7. The control device according to claim 1, characterized in that, the first energy storage unit is further used for supplying power to the switching power supply circuit with an output voltage greater than or equal to a first set voltage threshold within a first set time period when the external power supply is cut off; wherein, the first set time period is greater than or equal to the time period required for the controller to control the at least one valve body to change from the fully open state to the fully closed state; The first set voltage threshold is the lower limit of the operating voltage allowed by the switching power supply circuit.

8. The control device according to claim 1, wherein, the first energy storage unit and the controller are arranged on the same substrate.

9. The control device according to claim 2, wherein, the first energy storage unit includes: an electrolytic capacitor; the second energy storage unit includes: an electrolytic capacitor.

10. A control method for a control device according to any one of claims 1 to 9, wherein, comprising: determining that the external power supply is powered off; controlling the at least one valve body to close to a fully closed state.

11. The method according to claim 10, wherein, further comprising: after controlling the at least one valve body to close for a first set duration, the controller shuts down and cuts off the power; wherein, the first set duration is greater than or equal to the duration required for the controller to control the at least one valve body from a fully open state to a fully closed state.

12. The method according to claim 10, wherein, the determining that the external power supply is powered off includes: determining that the external power supply is powered off when the first power detection information is not received within a second set duration; wherein, the first power detection information is generated by the voltage detection circuit of the control device and is used to characterize that the external power supply is powered normally.

13. A control device for an air conditioner according to any one of claims 1 to 9, wherein, the controller is configured to execute the steps of the method according to any one of claims 10 to 12.

14. An electronic device, wherein, the electronic device is an air conditioner, comprising: at least one valve body and the control device according to claim 13.

15. A storage medium, on which a computer program is stored, wherein, when the computer program is executed by a processor, the steps of the method according to any one of claims 10 to 12 are implemented.

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