Electric appliance and overvoltage protection control method thereof

Abstract

The invention relates to the technical field of electric appliance overvoltage protection, particularly provides an electric appliance and an overvoltage protection control method thereof, and aims to solve the problem that a washing machine cannot be effectively protected under the condition of relatively high voltage instantaneous fluctuation in the existing overvoltage protection. In order to achieve the purpose, the overvoltage protection control method of the electric appliance comprises the following steps that whether a protection mode is started or not is determined according to a voltage value and the duration of the voltage value; and if the voltage value exceeds the first preset voltage and lasts for the first preset duration, the strong current of the electric appliance is cut off, so that the strong current system can be effectively protected. And if the voltage value exceeds the second preset voltage, the strong current and the weak current of the electric appliance are cut off, so that the strong current and weak current systems of the electric appliance are protected from being damaged due to overhigh voltage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of overvoltage protection of electrical appliances, and specifically provides an electrical appliance and an overvoltage protection control method thereof. BACKGROUND

[0002] With the development of economy and society, washing machines have become an essential household appliance in families. However, the voltage supplied by the power supply is unstable, and sometimes can even exceed 50% of the standard voltage. When the input voltage of the washing machine is too high, both the strong current system and the weak current system of the washing machine will malfunction.

[0003] In order to solve the above problems, the washing machine is currently equipped with an overvoltage protection module. Specifically, the input voltage is detected in real time, and when the voltage is detected to be continuously higher than a threshold value within a certain period of time, the strong current system is disconnected for protection.

[0004] However, the voltage does not rise slowly and continuously, and there are situations where it fluctuates sharply up and down in a short period of time. In this case, the voltage is too high and can damage the strong current system and the weak current system. If the detection method within a certain period of time is used, it cannot effectively protect the situation where the voltage fluctuates instantaneously.

[0005] Therefore, there is an urgent need for an electrical appliance and an overvoltage protection control method thereof to solve the above technical problems. SUMMARY

[0006] The present application aims to solve the above technical problems, i.e., to solve the problem that the existing overvoltage protection cannot effectively protect the washing machine in the case of high voltage fluctuation.

[0007] In a first aspect, the present application provides an overvoltage protection control method of an electrical appliance, which comprises the following steps:

[0008] According to the voltage value and the duration of the voltage value, it is determined whether to start the protection mode.

[0009] In the specific embodiment of the overvoltage protection control method of the electrical appliance, "determining whether to start the protection mode according to the voltage value and the duration of the voltage value" comprises:

[0010] If the voltage value exceeds a first preset voltage and lasts for a first preset duration, the protection mode is started.

[0011] In the specific embodiment of the overvoltage protection control method of the electrical appliance, the protection mode is to cut off the strong current of the electrical appliance.

[0012] In the specific embodiment of the overvoltage protection control method of the electrical appliance, "determining whether to start the protection mode according to the voltage value and the duration of the voltage value" comprises:

[0013] If the voltage value exceeds a second preset voltage after the protection mode is started, the weak electricity of the electrical appliance is cut off; the second preset voltage is greater than the first preset voltage.

[0014] In the embodiment of the overvoltage protection control method of the electrical appliance, determining whether to start the protection mode according to the voltage value and the duration of the voltage value comprises:

[0015] If the voltage value exceeds a second preset voltage, the protection mode is started; the second preset voltage is greater than the first preset voltage.

[0016] In the embodiment of the overvoltage protection control method of the electrical appliance, the protection mode is to cut off the strong electricity and the weak electricity of the electrical appliance at the same time.

[0017] In the embodiment of the overvoltage protection control method of the electrical appliance, if the voltage value is lower than a third preset voltage and lasts for a second preset duration after the protection mode is started, the protection mode is exited.

[0018] In the embodiment of the overvoltage protection control method of the electrical appliance, when only the strong electricity of the electrical appliance is cut off, exiting the protection mode comprises: resuming the supply of the strong electricity.

[0019] In the embodiment of the overvoltage protection control method of the electrical appliance, when the strong electricity and the weak electricity of the electrical appliance are cut off at the same time, exiting the protection mode comprises: resuming the supply of the strong electricity and the weak electricity.

[0020] In a second aspect, the present application provides an electrical appliance comprising a control module configured to perform the overvoltage protection control method of the electrical appliance as described above.

[0021] In the case of adopting the above technical solution, the overvoltage protection control method of the present application comprises the following steps: determining whether to start the protection mode according to the voltage value and the duration of the voltage value.

[0022] If the voltage value exceeds a first preset voltage and lasts for a first preset duration, the protection mode is started, and at this time, the protection mode is to cut off the strong electricity of the electrical appliance. Since the voltage value exceeds the first preset voltage and lasts for the first preset duration, it represents that the voltage fluctuation is relatively slow, and the rising amplitude is small within the time period. The voltage value is too high, but it is not very high. If the voltage value is used to supply power to the electrical appliance for a long time, the strong electricity system of the electrical appliance will be damaged. However, the voltage is not very high, and it will not form a sharp high voltage impact on the weak electricity system of the electrical appliance, so there is no need to close the weak electricity system, and only the strong electricity of the electrical appliance is cut off.

[0023] If the voltage value exceeds the second preset voltage after cutting off the strong electricity of the electrical appliance, the weak electricity of the electrical appliance is cut off; wherein the second preset voltage is greater than the first preset voltage. The voltage value exceeding the second preset voltage represents very high, at this time if the power supply continues, the weak electricity system of the electrical appliance is likely to be damaged, and cutting off the weak electricity can effectively protect the weak electricity system.

[0024] If the voltage value exceeds the second preset voltage, the protection mode is started; wherein the protection mode is cutting off the strong electricity and the weak electricity of the electrical appliance at the same time. When the voltage value exceeds the first preset voltage, but does not last for the first time length, the voltage value exceeds the second preset voltage, at this time it represents that the voltage rises relatively rapidly in a short time, in order to protect the strong electricity and the weak electricity system of the electrical appliance, the strong electricity and the weak electricity of the electrical appliance are cut off at the same time, and the strong electricity and the weak electricity system of the electrical appliance will not be damaged due to the high voltage. BRIEF DESCRIPTION OF DRAWINGS

[0025] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, in which:

[0026] Figure 1 It is the flow chart of the main steps of the overvoltage protection control method of the electrical appliance provided by the present application;

[0027] Figure 2 It is the flow chart of the detailed steps of the overvoltage protection control method of the electrical appliance provided by the present application. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0029] It should be noted that in the description of the present application, the terms indicating the direction or positional relationship of "up", "down", "left", "right", "inner", "outer" and the like are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and is not intended to indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Because the change of the voltage of the electrical appliance is not a slow and continuous rise, there is a situation of a sharp fluctuation in a short time, in which case the overvoltage can also damage the strong current system and the weak current system. If the detection mode in a certain time is adopted, for the case of a high instantaneous voltage fluctuation, the protection cannot be effectively carried out.

[0032] To solve the above technical problems, the embodiment discloses an electrical appliance, specifically a washing machine, the washing machine comprising a control module, the control module being configured to execute an overvoltage protection control method of the washing machine, so that the washing machine can start a protection program when the voltage is too high, so as to avoid damage of the washing machine due to the overvoltage. Specifically, it can avoid burning out the strong current system and the weak current system of the washing machine when the voltage is too high, for example, avoiding burning out the motor and other strong current systems of the washing machine due to the overvoltage, and also avoiding burning out the control panel and other weak current systems of the washing machine due to the overvoltage.

[0033] The washing machine is specifically a drum washing machine, which comprises a machine shell, an outer drum, an inner drum and a door assembly, etc. The outer drum is arranged inside the machine shell, the inner drum is rotatably arranged in the outer drum, and the inner drum is internally provided with washing ribs, which mainly play a role of rubbing clothes by a stirring machine. In the washing process, the clothes can be thrown and rubbed against the surface of the clothes to realize washing of the clothes. A driving motor is arranged at the back of the machine shell, which is connected with the inner drum through a connecting shaft, and the inner drum is driven to rotate by the motor, so as to realize washing, rinsing and dehydration of the washing machine. A water pump is further arranged at the bottom of the washing machine, which is connected with the outer drum and a drain pipe. When water needs to be drained, the water pump is opened to drain the water in the outer drum to the outside through the drain pipe. An electric heater is further arranged in the outer drum, which is used for heating the water in the outer drum, and is used for realizing heating washing and heating sterilization and disinfection. In addition, an ultraviolet sterilization lamp is arranged in the outer drum, which is used for emitting ultraviolet rays to realize ultraviolet sterilization and disinfection. The motor, the water pump, the electric heater and the ultraviolet lamp all use strong current, that is, the motor, the water pump, the electric heater and the ultraviolet lamp all belong to the strong current system of the washing machine. The door assembly is rotatably arranged at the window of the front end of the machine shell, wherein the door assembly comprises a door body, a rotating assembly, a door lock and a window gasket. The door body is rotatably connected with the machine shell through the rotating assembly. The door lock comprises two parts, which are arranged on the door body and the machine shell respectively. The door lock can lock the door body of the washing machine, so that the door body cannot be opened during the operation of the washing machine, thereby avoiding unnecessary safety accidents. The window gasket is arranged at the window of the machine shell, which is used for sealing the door body, so that the water in the outer drum and the inner drum cannot leak out. A spraying hole facing the inner drum is arranged at the top of the window gasket, which can spray water into the inner drum during washing and rinsing, so as to spray the clothes, and the washing machine can clean the clothes by spraying.

[0034] The control area is located on the front top of the machine casing, featuring a control panel and a touchscreen. The touchscreen displays function buttons for various wash modes, including regular wash, quick wash, super quick wash, soak wash, shirt, silk, denim, wool, down, cotton, sheet, rinse, spin-only, tumble dry, and drum self-cleaning. It also includes buttons for temperature, spin speed, and preset timer. The washing machine's operating mode is controlled via the touchscreen buttons. The control panel is the low-voltage electrical component; the circuit boards for the water pump, motor, and electric heater also belong to the washing machine's low-voltage system.

[0035] Regarding the electrical appliance, it should be noted that although it is specifically a washing machine in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, those skilled in the art can choose the electrical appliance as a dryer, air conditioner, refrigerator, dishwasher or oven, etc. However, these electrical appliances all have a control module, and the control module can perform overvoltage protection control methods. It primarily protects the high-voltage electrical systems of dryers, including the electric heater of the heating system, the fan of the ventilation system, and the water pump of the drainage system; the high-voltage electrical systems of air conditioners, including the compressor, outdoor unit fan motor, and indoor unit fan motor; the high-voltage electrical systems of refrigerators, including the compressor and fan motor; the high-voltage electrical systems of dishwashers, including the water pump, electric heater, and exhaust system fan; and the high-voltage electrical systems of ovens, including the electric heater and fan. It can also protect the low-voltage electrical systems of dryers, including the control panel, the circuit board of the electric heater in the heating system, the circuit board of the fan in the ventilation system, and the circuit board of the water pump in the drainage system; the low-voltage electrical systems of air conditioners, including the control panel, compressor circuit board, outdoor unit fan motor circuit board, and indoor unit fan motor circuit board; the low-voltage electrical systems of refrigerators, including the control panel, compressor circuit board, and fan motor circuit board; the low-voltage electrical systems of dishwashers, including the control panel, water pump circuit board, electric heater circuit board, and exhaust system fan circuit board; and the high-voltage electrical systems of ovens, including the control panel, electric heater circuit board, and fan circuit board. These do not deviate from the basic principles of the present invention and will fall within the protection scope of the present invention.

[0036] Among them, such as Figure 1 As shown, the overvoltage protection control method for electrical appliances mainly includes the following steps:

[0037] S1. Obtain the current voltage value of the electrical appliance and the duration at which it remains at or above that voltage value;

[0038] S2. Determine whether to activate the protection mode based on the voltage value and the duration of the voltage value.

[0039] The protection mode includes cutting off the strong current of the electrical appliance, cutting off the weak current of the electrical appliance, and cutting off the strong current and the weak current of the electrical appliance at the same time; and different protection modes are started according to different conditions. When the voltage rise amplitude is small and the duration is long, only the strong current of the washing machine is cut off, and the overvoltage protection is performed on the strong current system; if the voltage continues to rise, when the rise amplitude is large, the weak current of the washing machine is cut off, and the protection is performed on the weak current system of the washing machine. If it is detected that the voltage value rises by a large amplitude in a short time, the strong current and the weak current of the washing machine are cut off at the same time, and the protection is performed on the weak current and the strong current of the washing machine.

[0040] The "determining whether to start the protection mode according to the voltage value and the duration of the voltage value" includes:

[0041] If the voltage value exceeds the first preset voltage and lasts for the first preset duration, the protection mode is started. At this time, the protection mode is cutting off the strong current of the electrical appliance. The first preset voltage is higher than the standard power supply voltage of the washing machine, and the specific value is determined according to the tolerance of the strong current system of the washing machine and the first preset duration. Under normal circumstances, the longer the first preset duration, the smaller the first preset voltage; the shorter the first preset duration, the larger the first preset voltage; that is, they are inversely proportional. The tolerance of the strong current system is also inversely proportional to the first preset voltage. The stronger the tolerance, the larger the first preset voltage value can be; the worse the tolerance, the smaller the first preset voltage value can be. In this embodiment, the first preset voltage = 120% of the rated voltage of the electrical appliance. It needs to be explained that although the first preset voltage = 120% of the rated voltage of the electrical appliance in this embodiment, this is not a limitation of the present application. Within the principle of the present application, those skilled in the art can select the first preset voltage = 125% of the rated voltage of the electrical appliance, or the first preset voltage = 130% of the rated voltage of the electrical appliance in other embodiments, which does not deviate from the basic principle of the present application and falls within the protection scope of the present application. The first preset duration is 10s in this embodiment. It needs to be explained that although the first preset duration is 10s in this embodiment, this is not a limitation of the present application. The first preset duration can also be 18s, 25s or 30s in other embodiments, which does not deviate from the basic principle of the present application and falls within the protection scope of the present application.

[0042] Since the voltage value exceeds the first preset voltage and lasts for the first preset time length, it represents that the voltage fluctuation is relatively slow and the rising amplitude is small within the time period. The voltage value is too high, but not very high. If the voltage value is used to power the electrical appliance for a long time, it will damage the strong current system of the electrical appliance, specifically the motor, water pump, and electric heater of the washing machine. However, the voltage is not very high and will not form a sharp impact on the weak current system of the electrical appliance, that is, it will not sharply impact the control panel and the circuit board of each device, and thus it is not necessary to close the weak current system, and the strong current of the electrical appliance can be cut off. The strong current switch is provided upstream of each strong current component (specifically the motor, water pump, and electric heater in this embodiment), and is connected in parallel between the strong current components. The strong current switch is equipped with a battery or a storage capacitor. When the strong current needs to be cut off, the strong current switch can be closed by the battery or the storage capacitor. When the strong current needs to be restored, the strong current switch can be opened by the battery or the storage capacitor. The detection component of the strong current voltage is provided upstream of the strong current switch, that is, it can continue to detect the current voltage of the electrical appliance after the strong current switch is closed, so as to restore the power supply after the current voltage of the electrical appliance is reduced. The detection component and the strong current switch are in communication connection. The detection component can transmit the detected voltage to the main control board of the strong current switch in real time, so that the main control board controls the state of the strong current switch, specifically controls the strong current switch to be in an open state or a closed state. The main control board and the detection component are connected to the battery or the storage capacitor, which is also powered by the battery or the storage capacitor, so that it can detect the voltage and perform corresponding control. Specifically, whether to restore the power supply, whether to cut off the strong current, and whether to cut off the weak current.

[0043] “According to the voltage value and the duration of the voltage value, determine whether to start the protection mode” further includes:

[0044] After the strong current of the electrical appliance is cut off, if the voltage value exceeds the second preset voltage, the weak current of the electrical appliance is cut off; wherein the second preset voltage is greater than the first preset voltage. The voltage value exceeding the second preset voltage represents that it is very high, and if the power supply continues at this time, it is likely to damage the weak current system of the electrical appliance. Therefore, at this time, the weak current of the electrical appliance is cut off to protect the weak current system of the electrical appliance from being damaged due to the high voltage. In this embodiment, the second preset voltage is 140% of the rated voltage of the electrical appliance. It needs to be explained that although in this embodiment, the second preset voltage is 140% of the rated voltage of the electrical appliance, this is not a limitation of the present application. Within the principle of the present application, those skilled in the art can select the second preset voltage to be 145% of the rated voltage of the electrical appliance, or the second preset voltage to be 150% of the rated voltage of the electrical appliance in other embodiments, which does not deviate from the basic principle of the present application and falls within the protection scope of the present application.

[0045] The electrical appliance is provided with a weak current switch, which is arranged upstream of the weak current system. Each weak current component of the weak current system is connected in parallel to the weak current switch. The weak current switch controls whether to supply weak current to each weak current component (in this embodiment, specifically the control panel and the circuit board of the strong current component, etc.). The weak current switch is also in communication connection with the main control board, and the state of the weak current switch is controlled by the main control board, that is, the weak current switch is opened to supply weak current to the weak current component, or the weak current switch is closed to stop supplying power to the weak current component, that is, the weak current of the electrical appliance is cut off. The weak current switch is provided with a battery or a storage capacitor, and the battery or the storage capacitor supplies power to the weak current switch to switch the state of the weak current switch.

[0046] The "determining whether to start the protection mode according to the voltage value and the duration of the voltage value" further includes:

[0047] If the voltage value exceeds the second preset voltage, the protection mode is started. The protection mode is to simultaneously cut off the strong current and the weak current of the electrical appliance.

[0048] If the voltage value exceeds the first preset voltage but does not last for the first duration, and the voltage value exceeds the second preset voltage, it means that the voltage rises relatively rapidly in a short time. In order to protect the strong current and weak current system of the electrical appliance, the strong current and weak current of the electrical appliance are simultaneously cut off, so that the strong current and weak current system of the electrical appliance is not damaged due to high voltage. Specifically, when the detection component detects that the voltage value exceeds the second preset voltage, the main control board controls the strong current switch and the weak current switch to be disconnected, so as to cut off the supply of strong current to the strong current component and the supply of weak current to the weak current component, and protect the strong current component and the weak current component from being damaged by high voltage impact, and ensure that the strong current component and the weak current component are not damaged.

[0049] After the protection mode is started, if the voltage value is lower than the third preset voltage and lasts for the second preset duration, the protection mode is exited. The third preset voltage is less than or equal to the first preset voltage, that is, the third preset voltage is not greater than the first preset voltage.

[0050] In the embodiment, the third preset voltage is 98% of the first preset voltage. It should be noted that although the third preset voltage is 98% of the first preset voltage in the embodiment, this is not a limitation of the present application. Without departing from the principles of the present application, a person skilled in the art can select the third preset voltage to be 97% of the first preset voltage or 95% of the first preset voltage in other embodiments, which does not deviate from the basic principles of the present application and falls within the protection scope of the present application. The second preset time length is 30 seconds in the embodiment. It should be noted that although the second preset time length is 30 seconds in the embodiment, this is not a limitation of the present application. The second preset time length can also be 50 seconds, 1 minute or 2 minutes in other embodiments, which does not deviate from the basic principles of the present application and falls within the protection scope of the present application.

[0051] When the enabled protection mode is only cutting off the strong current of the electrical appliance, the exiting of the protection mode includes: resuming the supply of the strong current, that is, controlling the strong current switch to open.

[0052] When the enabled protection mode is cutting off both the strong current and the weak current of the electrical appliance, the exiting of the protection mode includes: resuming the supply of the strong current and the weak current, that is, controlling the weak current switch and the strong current switch to open. Cutting off both the strong current and the weak current of the electrical appliance includes cutting off both the strong current and the weak current of the electrical appliance at the same time, and also includes cutting off the strong current of the electrical appliance first due to the voltage exceeding the first preset voltage, and then cutting off the weak current of the electrical appliance due to the voltage continuing to rise to exceed the second preset voltage.

[0053] After the electrical appliance exits the protection mode, the working mode before the electrical appliance enters the protection mode is resumed. For example, if the washing machine was performing a washing program before entering the protection mode, the washing program is continued after the washing machine exits the protection mode; if the washing machine was performing a rinsing program before entering the protection mode, the rinsing program is continued after the washing machine exits the protection mode; if the washing machine was performing a dehydration program before entering the protection mode, the dehydration program is continued after the washing machine exits the protection mode.

[0054] As shown in Figure 2 The overvoltage protection control method of the electrical appliance specifically includes the following detailed steps:

[0055] S01, obtaining a current voltage value of the electrical appliance;

[0056] S02, determining whether the voltage value is greater than a first preset voltage; if yes, proceeding to step S03; if no, proceeding to step S11;

[0057] S03, determining whether the voltage value is greater than a second preset voltage; if yes, proceeding to step S04; if no, proceeding to step S08;

[0058] S04, judging whether the strong electricity of the electrical appliance is disconnected; if yes, going to step S05; if no, going to step S07;

[0059] S05, judging whether the weak electricity of the electrical appliance is disconnected; if yes, going to step S01 after a third preset time length; if no, going to step S06;

[0060] S06, cutting off the weak electricity of the electrical appliance, and going to step S01 after a third preset time length;

[0061] S07, cutting off the strong electricity of the electrical appliance, and going to step S05;

[0062] S08, judging whether the strong electricity of the electrical appliance is disconnected; if yes, going to step S01 after a third preset time length; if no, going to step S09;

[0063] S09, judging whether the voltage value greater than the first preset value reaches the first preset time length; if yes, going to step S10; if no, going to step S01 after a third preset time length;

[0064] S10, cutting off the strong electricity of the electrical appliance, and going to step S01 after a third preset time length;

[0065] S11, judging whether the voltage value is less than the third preset voltage; if yes, going to step S12; if no, going to step S01 after a third preset time length;

[0066] S12, judging whether the weak electricity of the electrical appliance is disconnected; if yes, going to step S13; if no, going to step S15;

[0067] S13, judging whether the voltage value lower than the third preset voltage lasts the second preset time length; if yes, going to step S014; if no, going to step S01 after a third preset time length;

[0068] S014, restoring the strong electricity and the weak electricity of the electrical appliance, and going to step S01 after a third preset time length;

[0069] S015, judging whether the strong electricity of the electrical appliance is disconnected; if yes, going to step S016, if no, going to step S01 after a third preset time length;

[0070] S016, restoring the strong electricity of the electrical appliance, and going to step S01 after a third preset time length.

[0071] The technical scheme of the present application has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical schemes after the changes or replacements will all fall within the protection scope of the present application.

Claims

1. An overvoltage protection control method for an electrical appliance, characterized in that, Includes the following steps: The protection mode is activated based on the voltage value and the duration of the voltage value.

2. The overvoltage protection control method according to claim 1, characterized in that, "Determining whether to activate the protection mode based on the voltage value and the duration of the voltage value" includes: If the voltage value exceeds the first preset voltage and remains so for a first preset duration, the protection mode is activated.

3. The overvoltage protection control method according to claim 2, characterized in that, The protection mode is to cut off the high voltage of the electrical appliance.

4. The overvoltage protection control method according to claim 2, characterized in that, "Determining whether to activate the protection mode based on the voltage value and the duration of the voltage value" also includes: After the protection mode is activated, if the voltage value exceeds the second preset voltage, the low-voltage power of the appliance is cut off; the second preset voltage is greater than the first preset voltage.

5. The overvoltage protection control method according to claim 1, characterized in that, "Determining whether to activate the protection mode based on the voltage value and the duration of the voltage value" also includes: If the voltage value exceeds the second preset voltage, the protection mode is activated; the second preset voltage is greater than the first preset voltage.

6. The overvoltage protection control method according to claim 6, characterized in that, The protection mode is to simultaneously cut off both the high-voltage and low-voltage power to the electrical appliance.

7. The overvoltage protection control method according to any one of claims 1-6, characterized in that, After the protection mode is activated, if the voltage value is lower than the third preset voltage and remains so for a second preset duration, the protection mode is deactivated; wherein the third preset voltage is less than or equal to the first preset voltage.

8. The overvoltage protection control method according to claim 7, characterized in that, Exiting the protection mode by simply cutting off the high-voltage power to the electrical appliance includes restoring the high-voltage power supply.

9. The overvoltage protection control method according to claim 7, characterized in that, When both the high-voltage and low-voltage power supplies to the electrical appliance have been disconnected, exiting the protection mode includes restoring the power supply to both the high-voltage and low-voltage power supplies.

10. An electrical appliance comprising a control module configured to perform an overvoltage protection control method for the electrical appliance as described in any one of claims 1-9.

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