Household appliance

Abstract

The embodiment of the invention belongs to the technical field of household appliances, and provides a household appliance. The load is electrically connected with the controller; a power plug; a plug body; the negative plate is arranged on the first side of the plug body; the detection device is arranged on the first side of the plug body, and the length of the detection device is smaller than that of the pole piece; the first end of the detection circuit is connected with the negative pole piece of the power plug through a detection device, and the second end of the detection circuit is connected with the controller. The method comprises the following steps: when the distance between the plug body and the socket is increased to a first preset distance, disconnecting the connection between the negative plate and the detection circuit through the detection device; outputting a first signal to the controller through the detection circuit; and the controller controls the load to stop running. Therefore, safety can be ensured when the power plug of the household electrical appliance is unplugged from the socket.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of household appliances, and more specifically, to a household appliance. Background Art

[0002] Some household appliances, such as induction cookers, variable frequency air conditioners, refrigerators, etc., can be powered by a DC socket. When a user unplugs the power plug of a household appliance from a DC socket, if the household appliance is in operation, an arc may be generated when the plug is disconnected from the socket, which may cause safety problems.

[0003] Currently, a reminder note is usually posted in the instruction manual of a household appliance or on the surface of a refrigerator to remind the user to turn off the household appliance before unplugging the power plug.

[0004] However, although the above method can play a certain role in prompting, the user may forget to turn off the household appliance, or ignore the prompt, and the household appliance may still be in working state when the plug is unplugged. Therefore, how to make the household appliance in the off state before the user unplugs the power plug is a problem that needs to be solved. Summary of the invention

[0005] The embodiment of the present application provides a household appliance, which can reduce the occurrence of arcs when a user unplugs a power plug, thereby improving safety.

[0006] In a first aspect, an embodiment of the present application provides a household appliance, including:

[0007] Controller;

[0008] a load, the load being electrically connected to the controller;

[0009] Power plug;

[0010] Plug body;

[0011] A negative electrode sheet, disposed on a first side of the plug body;

[0012] A detection device, disposed on the first side of the plug body, and the length of the detection device is shorter than the pole piece;

[0013] A detection circuit, wherein a first end of the detection circuit is connected to the negative electrode of the power plug through the detection device, and a second end of the detection circuit is connected to the controller;

[0014] The detection device is configured to disconnect the negative electrode sheet from the detection circuit when the distance between the plug body and the socket increases to a first preset distance;

[0015] The detection circuit is configured to output a first signal to the controller when the connection between the negative electrode sheet and the detection circuit is disconnected;

[0016] The controller is configured to control the load to stop running according to the first signal when receiving the first signal.

[0017] In the present application, a detection device is provided on the power plug. When the distance between the plug body of the power plug and the socket increases to a certain value, it indicates that the user may unplug the plug from the socket. At this time, a signal is sent to the controller through the detection circuit, so that the controller controls the load of the household appliance to stop running. Before the user unplugs the power plug, the load of the household appliance stops running, which can avoid the problem of arcing when unplugging the plug and improve safety.

[0018] In some embodiments of the present application, the detection device includes a touch switch;

[0019] The distance between the touch switch and the negative electrode sheet is less than or equal to a second preset distance;

[0020] The touch switch is configured to switch from a closed state to an open state when the distance between the plug body and the socket increases to a first preset distance, so that the connection between the negative electrode sheet and the detection circuit is disconnected.

[0021] In the present application, a touch switch is used to control the on and off of the connection between the negative electrode sheet and the detection circuit. The touch switch is small in size and has a sensitive response, which can improve the safety of control.

[0022] In some embodiments of the present application, the detection circuit includes a power supply circuit and a comparator;

[0023] The first end of the power supply circuit is connected to the first input end of the comparator, the second end of the power supply circuit is connected to the second input end of the comparator, the third end of the power supply circuit is connected to the negative electrode sheet through the touch switch, and the output end of the comparator is connected to the controller;

[0024] The touch switch is configured to switch from a closed state to an open state when the distance between the plug body and the socket increases to a first preset distance, so that the connection between the negative electrode sheet and the third end of the power supply circuit is disconnected;

[0025] The comparator is configured to output the first signal to the controller when the connection between the negative electrode sheet and the third end of the power supply circuit is disconnected.

[0026] In the present application, the power supply circuit and the comparator can be used to enable the controller to receive different signals in different situations.

[0027] In some embodiments of the present application, the power supply circuit includes:

[0028] A weak current power supply, a first resistor, a second resistor, a third resistor, and a fourth resistor;

[0029] The weak current power supply is connected to the first end of the first resistor and the first end of the second resistor respectively, the second end of the second resistor is connected to the first input end of the comparator and the first end of the third resistor respectively, and the second end of the third resistor is grounded; the second end of the fourth resistor is connected to the second input end of the comparator;

[0030] The second end of the first resistor is connected to the first end of the fourth resistor, and the second end of the first resistor is also connected to the negative electrode sheet through the touch switch.

[0031] In the present application, through a simple combination of resistors, it can be achieved that when the detection device controls the on and off of the circuit, the voltages input from the power supply circuit to the two input terminals of the comparator are different.

[0032] In some embodiments of the present application, the detection device further includes a light emitting element, wherein the light emitting element is disposed on a second side of the plug body, and the second side of the plug body is a side of the plug body away from the pole piece;

[0033] The first end of the light emitting element is connected to the second end of the first resistor, and the second end of the light emitting element is connected to the negative electrode sheet through the touch switch;

[0034] The light emitting element is configured to be extinguished when the distance between the plug body and the socket increases to the first preset distance.

[0035] In the present application, a light emitting element is provided on the power plug, and the light emitting element goes out to remind the user that the plug body is to be away from the socket.

[0036] In some embodiments of the present application, the touch switch is further configured to switch from an open state to a closed state when the distance between the plug body and the socket is reduced to a third preset distance, connecting the cathode plate and the second end of the light-emitting element, so that the light-emitting element emits light;

[0037] The comparator is further configured to output a second signal to the controller when the cathode plate is connected to the second end of the light emitting element;

[0038] The controller is further configured to control the load to operate after a first preset time period when the second signal is received.

[0039] In the present application, when the user plugs the power plug into the socket, the scene can be determined by the touch switch and the detection circuit, so that the controller can control the load to run. And by controlling the load to run after the first preset time, when the load is controlled to run, the plug has been stably plugged into the socket, and a relatively stable voltage can be input to the load, which can improve the safety of household appliances.

[0040] In some embodiments of the present application, the power plug further includes:

[0041] a metal element disposed on a side wall of the plug body, the metal element covering part or all of the side wall of the plug body, the side wall being located between the first side and the second side;

[0042] A connecting wire, a first end of which is connected to the metal element, and a second end of which is connected to the controller;

[0043] The metal element is configured to generate a first electrical signal when an object with an electromagnetic field contacts the metal element, and transmit the first electrical signal to the controller through the connecting line;

[0044] The controller is further configured to control the load to stop running according to the first electrical signal.

[0045] In the present application, by arranging a metal element on the side wall of the power plug, when the user unplugs the power plug, the user's hand will touch the metal element, and the magnetic field of the user's body can cause the metal element to generate an electrical signal, so that the controller can control the load to stop running when the user's hand touches the metal element. It can also be achieved that when the user is about to unplug the power plug but has not yet disconnected the electrical connection between the plug and the socket, the load is controlled to stop running, so that when the electrical connection between the plug and the socket is disconnected, the load is in a stopped state, reducing the generation of arcs.

[0046] In some embodiments of the present application, the household appliance further includes:

[0047] Operational amplifiers and filter circuits;

[0048] The first end of the operational amplifier is connected to the metal sheet through the connecting line, the second end of the operational amplifier is connected to the input end of the filter circuit, and the output end of the filter circuit is connected to the controller;

[0049] The operational amplifier is configured to amplify the first electrical signal to obtain a second electrical signal, and transmit the second electrical signal to the filter circuit;

[0050] The filtering circuit is configured to filter the second electrical signal to obtain a third electrical signal, and transmit the third electrical signal to the controller;

[0051] The controller is configured to control the load to stop running according to the third electrical signal.

[0052] In the present application, the electrical signal generated by the metal element is processed by an operational amplifier and a filter circuit, so that the electrical signal received by the controller is purer, which can improve the accuracy of controlling the load to stop running.

[0053] In some embodiments of the present application, the controller is configured to determine whether the third electrical signal is within a preset range, and if the third electrical signal is within the preset range, control the load to stop running according to the third electrical signal.

[0054] In the present application, by setting a preset range, the controller can respond only to the electrical signals generated by the magnetic field of the human body, and not respond to other electrical signals (for example, pets in the home, dust, etc.), thereby improving the accuracy of the controller control.

[0055] In some embodiments of the present application, the controller is further configured to:

[0056] When the first signal and the third electrical signal are received, the load is controlled to stop running.

[0057] In the present application, the load is controlled to stop running only when two signals are received, which can reduce the situation of misjudgment and improve the accuracy of controller control.

[0058] In some embodiments of the present application, the household appliance further includes a display screen;

[0059] The controller is further configured to control display of a first prompt message on the display screen when receiving the third electrical signal, wherein the first prompt message is used to prompt a user to perform a safety check on the household appliance.

[0060] In the present application, considering that the third electrical signal may not be generated by manually unplugging the plug, the user is prompted by displaying the first prompt information.

[0061] In some embodiments of the present application, the controller is further configured to:

[0062] When the load is controlled to stop running according to the third electrical signal, after a second preset time period, detecting whether the first signal and the third electrical signal exist;

[0063] If the first signal and / or the third electrical signal do not exist, the load is controlled to operate and the first prompt information is output.

[0064] In the present application, considering that the third electrical signal may not be generated by artificially pulling out the plug, further detection is performed, and if it is determined to be a false judgment, the load is controlled to continue running.

[0065] In some embodiments of the present application, the controller is further configured to:

[0066] When the load is controlled to stop running according to the first signal, after a second preset time, detecting whether there is voltage input from the pole piece of the power plug;

[0067] If voltage is input from the pole piece of the power plug, the load is controlled to run and a second prompt message is output, wherein the second prompt message prompts the user to check the connection between the power plug and the socket.

[0068] In the present application, considering that the first signal may be caused by non-human plug-pulling situations such as a loose plug, the voltage input situation is further detected. If there is voltage input, it can be determined that the first signal is not caused by human plug-pulling. Therefore, the load operation can be controlled and the user can be prompted to perform a safety check.

[0069] In a second aspect, the present application provides a household appliance, comprising:

[0070] Controller;

[0071] a load, electrically connected to the controller;

[0072] The plug body is configured to control the operation of the load through the controller when connected to a power source;

[0073] a detection unit connected to the plug body and the controller, and configured to output a first signal to the controller when the distance between the plug body and the socket increases to a first preset distance during a process in which a user unplugs the plug body from the socket;

[0074] When receiving the first signal, the controller controls the load to stop running.

[0075] In a third aspect, the present application provides a control method for a household appliance, the household appliance comprising:

[0076] Controller;

[0077] a load, the load being electrically connected to the controller;

[0078] Power plug;

[0079] Plug body;

[0080] A negative electrode sheet, disposed on a first side of the plug body;

[0081] A detection device, disposed on the first side of the plug body, and the length of the detection device is shorter than the pole piece;

[0082] A detection circuit, wherein a first end of the detection circuit is connected to the negative electrode of the power plug through the detection device, and a second end of the detection circuit is connected to the controller;

[0083] The method comprises:

[0084] When the distance between the plug body and the socket increases to a first preset distance, the connection between the negative electrode sheet and the detection circuit is disconnected by the detection device;

[0085] When the connection between the negative electrode sheet and the detection circuit is disconnected, a first signal is output to the controller through the detection circuit;

[0086] When the first signal is received, the controller controls the load to stop running according to the first signal.

[0087] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a computer, they are used to implement the method described in the second aspect.

[0088] The computer-readable storage medium provided in the embodiment of the present application can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be repeated here.

[0089] In a fifth aspect, the present application provides a computer program product, including a computer program, which is used to implement the method described in the second aspect when executed by a computer.

[0090] The computer program product provided in the embodiment of the present application can execute the technical solution in the above method embodiment, and its beneficial effects are similar and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0092] Figure 1 is a schematic diagram of a circuit structure of a household appliance according to some embodiments;

[0093] Figure 2 is a schematic diagram of a power plug according to some embodiments;

[0094] Figure 3 A schematic diagram of the circuit structure of another household appliance provided in an embodiment of the present application;

[0095] Figure 4 is a schematic diagram of a circuit structure of yet another household appliance according to some embodiments;

[0096] Figure 5 is a schematic diagram of the position of a light emitting element according to some embodiments;

[0097] Figure 6 is a schematic diagram of a circuit structure of a household appliance including a light-emitting element according to some embodiments;

[0098] Figure 7 is a schematic diagram of the location of a metal element according to some embodiments;

[0099] Figure 8 is a schematic diagram of a circuit structure of a household appliance including a metal element according to some embodiments;

[0100] Fig. 9 A schematic diagram of a circuit structure of another household appliance including a metal component according to some embodiments

[0101] Fig.10 Schematic diagram of a circuit structure between a metal element and a controller according to some embodiments. DETAILED DESCRIPTION

[0102] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0103] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0104] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components explicitly listed but may include other components not explicitly listed or inherent to such products or devices.

[0105] In some household appliances, such as induction cookers, variable frequency air conditioners, refrigerators, etc., the use of DC power can better achieve precise power control and speed regulation. DC sockets can transmit processed DC power to the inside of household appliances, which can improve the energy efficiency of household appliances.

[0106] When the user unplugs the power plug of a household appliance from a DC socket, if the household appliance is working and the power plug is disconnected from the socket, an arc will be generated at the moment when the metal electrode of the power plug is disconnected, ionizing the nearby air. The charged ions will short-circuit the two poles of the DC socket to generate a larger arc. Since DC power does not have a zero point like the current in an AC circuit, it is difficult to extinguish the arc once it is generated. The heat generated by the arc is large, which may cause safety problems. Therefore, the safety standard for DC household appliances requires: Instructions for how to safely cut off the power supply should be given in the instructions for use.

[0107] In some implementations, the user is reminded to turn off the appliance before unplugging the power plug, usually in the appliance manual or in a reminder note posted on the appliance surface, such as "Caution: Directly unplugging the power plug may cause arcing. Please turn off the appliance function before unplugging the power plug."

[0108] However, in the above implementation, the user may forget to turn off the household appliance in advance, or the user may not know that the household appliance has such a requirement. Therefore, it is still possible that the household appliance is in working state when the user unplugs the plug, thus causing safety problems.

[0109] Based on this, the present application provides a household appliance, by setting a detection device on the plug body of the power plug of the household appliance, and adding a detection circuit inside the household appliance, the detection device can control the connection between the detection circuit and the negative electrode of the power plug when the distance between the plug body and the socket increases. In this way, when the user unplugs the power plug from the socket, the distance between the plug body and the socket will gradually increase. When it increases to a certain value, the connection between the detection circuit and the negative electrode of the power plug can be disconnected, thereby changing the loop of the detection circuit, so that the detection circuit outputs a corresponding signal to the controller, and the controller can control the load of the household appliance to stop running based on the signal. When the user has not completely unplugged the power plug from the socket, the load of the household appliance is controlled to stop running, which can effectively reduce the arc generated when the plug is unplugged, and improve the safety of the household appliance.

[0110] The technical solution of the present application is described in detail below in conjunction with specific embodiments. The following specific embodiments can be combined with each other or exist independently. The same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0111] Figure 1 A schematic diagram of a circuit structure of a household appliance according to some embodiments.

[0112] like Figure 1 As shown, the household appliance includes a controller 10 , a power plug 20 and a detection circuit 30 .

[0113] The power plug is provided with a detection device 21, and the power plug can be Figure 2 shown. Figure 2 is a schematic diagram of a power plug according to some embodiments.

[0114] like Figure 2 As shown, the power plug 20 includes a detection device 21, a plug body 22 and a pole piece 23. The pole piece 23 includes a negative pole piece 231, a positive pole piece 232 and a grounding pole piece 233 which are arranged at intervals, and the pole pieces 23 are all arranged on the first side of the plug body 22, and the detection device 21 is also arranged on the first side of the plug body 22, and the length of the detection device 21 is shorter than the pole piece.

[0115] The first side of the plug body 22 is as shown in FIG. Figure 2 Side A shown.

[0116] It should be noted that, since the detection device 21 can control the conduction and disconnection between the detection circuit 30 and the negative electrode sheet 231, the detection device 21 can be arranged around the negative electrode sheet 231, such as Figure 2Of course, it can also be set at other positions, which is not specifically limited in the embodiments of the present application.

[0117] like Figure 1 As shown, the first end of the detection circuit is connected to the negative electrode 231 of the power plug 20 through the detection device 21, and the second end of the detection circuit 30 is connected to the controller 10.

[0118] Exemplarily, when the distance between the plug body 22 and the socket increases to a first preset distance, the connection between the negative electrode sheet 231 and the detection circuit 30 can be disconnected by the detection device 21, such as Figure 1 When the negative electrode sheet 231 is disconnected from the detection circuit 30, the detection circuit 30 outputs a first signal to the controller 10. When the controller 10 receives the first signal, it controls the load of the household appliance to stop running according to the first signal.

[0119] The distance between the plug body 22 and the socket is the distance between the first side of the plug body and the surface of the socket, and the embodiment of the present application does not limit this distance.

[0120] The first preset distance can be set according to the length of the pole piece of the power plug 20. When the distance between the plug body 22 and the socket is equal to the first preset distance, the pole piece of the power plug 20 and the socket are connected, that is, the socket can supply power to the load of the household appliance through the pole piece. When the distance between the plug body and the socket is greater than the first preset distance, the pole piece of the power plug 20 is disconnected from the socket. For example, the first preset distance is 1 cm, and when the distance between the plug body 22 and the socket is 1.5 cm or 2 cm, the connection between the pole piece of the power plug 20 and the socket is disconnected.

[0121] Understandably, Figure 1 The positive electrode sheet 232 and the negative electrode sheet 231 shown are electrodes connected to the load of the household appliance to supply power to the load of the household appliance. Figure 1 The load of household appliances is not shown.

[0122] In this way, when the distance between the power plug 20 and the socket increases to the first preset distance, the user may want to unplug the power plug 20 from the socket. At this time, the controller 10 will control the load of the household appliance to stop working. It can be achieved that when the power plug 20 is not disconnected from the socket, the load of the household appliance is controlled to stop working, which can reduce the arc generated between the plug and the socket when the power plug 20 is unplugged, thereby improving the safety of the use of household appliances.

[0123] In the embodiment of the present application, the detection device 21 may be a simple elastic device or a touch switch 211 .

[0124] In a possible implementation, the detection device 21 includes a touch switch 211; the distance between the touch switch 211 and the negative electrode sheet 231 is less than or equal to a second preset distance.

[0125] Exemplarily, when the user unplugs the power plug 20 from the socket, when the distance between the plug body 22 and the socket increases to a first preset distance, the touch switch 211 switches from a closed state to an open state, thereby disconnecting the connection between the negative electrode 231 and the detection circuit 30.

[0126] Exemplarily, when the user plugs the power plug 20 into the socket, when the distance between the plug body 22 and the socket is reduced to a third preset distance, the touch switch 211 switches from an open state to a closed state, so that the negative electrode 231 is connected to the detection circuit 30.

[0127] It can be understood that after the touch switch 211 is switched from the open state to the closed state, so that the negative electrode 231 is connected to the detection circuit 30, the detection circuit 30 can output a second signal to the controller 10. The controller 10 receives the second signal and controls the load operation according to the second signal.

[0128] In this way, the connection and disconnection between the detection circuit 30 and the negative electrode 231 of the power plug 20 are controlled by the touch switch 211, so that the control process is more accurate.

[0129] Exemplarily, when the controller 10 controls the operation of the load according to the second signal, the controller 10 may control the operation of the load after a first preset time interval when the second signal is received.

[0130] The first preset duration may be 5 seconds or 10 seconds, etc., which is not limited in the embodiment of the present application.

[0131] Since the voltage supplied to the load may not be stable enough when the power plug 20 is connected to the socket, the load operation is controlled after the first preset time period so that the voltage supplied to the load is in a stable state when the load is running.

[0132] In another possible implementation, when the detection device 21 is an elastic device, a spring and a conductive component connected to the spring can be built into the elastic device. The spring will deform with the distance between the plug body 22 and the socket. When the spring is deformed, it will drive the conductive component to move, so as to control the conduction and disconnection between the detection circuit 30 and the negative electrode 231 of the power plug 20 through the conductive component.

[0133] For example, when the user plugs the power plug 20 into the socket, the distance between the plug body 22 and the socket gradually decreases. When the elastic device contacts the socket, as the distance between the plug body 22 and the socket continues to decrease, the spring in the elastic device will be squeezed. During the squeezing process, the spring will drive the conductive component to move, so that the negative electrode 231 is connected to the detection circuit 30.

[0134] When the user unplugs the power plug 20 from the socket, the distance between the plug body 22 and the socket gradually increases, and the spring in the elastic device gradually relaxes from the squeezed state. During this process, the spring drives the conductive component to move, thereby disconnecting the negative electrode 231 from the detection circuit 30.

[0135] Next, the household appliance of the present application is described in detail by taking the detection device 21 as a touch switch 211 .

[0136] In the present application, the detection circuit 30 may include a power supply circuit 3131 and a comparator 3232. For details, see Figure 3 As shown, Figure 3 A schematic diagram of the circuit structure of another household appliance provided in an embodiment of the present application.

[0137] like Figure 3 As shown, the first end of the power supply circuit 31 is connected to the first input end of the comparator 32, the second end of the power supply circuit 31 is connected to the second input end of the comparator 32, the third end of the power supply circuit 31 is connected to the negative electrode 231 through the touch switch 211, and the output end of the comparator 32 is connected to the controller 10.

[0138] based on Figure 3 As shown, when the negative electrode sheet 231 is connected to the third end of the power supply circuit 31 and is disconnected, the input end and the output end of the comparator 32 are different in size, so that the comparator 32 can output different signals.

[0139] Exemplarily, when the user unplugs the power plug 20 from the socket, when the distance between the plug body 22 and the socket increases to a first preset distance, the touch switch 211 switches from a closed state to an open state, thereby disconnecting the connection between the negative electrode 231 and the third end of the power supply circuit 31.

[0140] When the connection between the negative electrode sheet 231 and the third terminal of the power supply circuit 31 is disconnected, the comparator 32 outputs a first signal to the controller 10 .

[0141] Exemplarily, when the user plugs the power plug 20 into the socket, when the distance between the plug body 22 and the socket is reduced to a third preset distance, the touch switch 211 switches from an open state to a closed state, so that the negative electrode 231 is connected to the detection circuit 30.

[0142] When the negative electrode sheet 231 is connected to the third terminal of the power supply circuit 31 , the comparator 32 outputs a second signal to the controller 10 .

[0143] In this way, different signals are input to the two input terminals of the comparator 32 through the power supply circuit 31, so that when the connection conditions between the power supply circuit 31 and the negative electrode 231 of the power plug 20 are different, the comparator 32 can output different signals, so that the controller 10 is controlled based on different signals.

[0144] In the present application, the power supply circuit 31 may be as follows Figure 4 As shown, Figure 4 Schematic diagram of a circuit structure of another household appliance according to some embodiments.

[0145] like Figure 4 As shown, the power supply circuit 31 includes a weak current power supply, a first resistor, a second resistor, a third resistor, and a fourth resistor.

[0146] The weak current power supply is respectively connected to the first end of the first resistor and the first end of the second resistor, the second end of the second resistor is respectively connected to the first input end of the comparator 32 and the first end of the third resistor, the second end of the third resistor is grounded; the second end of the fourth resistor is connected to the second input end of the comparator 32.

[0147] The second end of the first resistor is connected to the first end of the fourth resistor, and the second end of the first resistor is also connected to the negative electrode sheet 231 through the touch switch 211 .

[0148] Exemplarily, when the user unplugs the power plug 20 from the socket, when the distance between the plug body 22 and the socket increases to a first preset distance, the touch switch 211 switches from a closed state to an open state, and the connection between the negative electrode 231 and the second end of the first resistor is disconnected, so that the circuit between the low-voltage power supply, the first resistor and the negative electrode 231 is disconnected.

[0149] like Figure 4 As shown, since the comparator 32 can be equivalent to a resistor with a larger resistance value, it is much larger than the resistance value of the first resistor and the fourth resistor. Therefore, when the circuit between the weak current power supply, the first resistor and the negative electrode sheet 231 is disconnected, the voltage of the second input terminal of the comparator 32 inputted by the weak current power supply after passing through the first resistor and the fourth resistor is approximately equal to the voltage of the second weak current power supply. Therefore, the voltage of the first input terminal of the comparator 32 is less than the voltage of the second input terminal, and the comparator 32 outputs the first signal to the controller 10.

[0150] The controller 10 can determine that the user wants to unplug the power plug 20 from the socket based on the received first signal. At this time, the controller 10 controls the load to stop running, so that when the power plug 20 is unplugged from the socket, the load of the household appliance is in a stopped state. This can avoid the occurrence of an arc when the user unplugs the power plug 20 from the socket, thereby improving the safety of the household appliance during use.

[0151] Exemplarily, when the user plugs the power plug 20 into the socket, when the distance between the plug body 22 and the socket is reduced to a third preset distance, the touch switch 211 is switched from an open state to a closed state, and the negative electrode 231 is connected to the second end of the first resistor, so that the circuit between the low-voltage power supply, the first resistor and the negative electrode 231 is turned on.

[0152] When the circuit between the weak power supply, the first resistor and the negative electrode sheet 231 is turned on, the weak power supply inputs a voltage to the first input terminal of the comparator 32 through the second resistor, and the voltage at the first input terminal of the comparator 32 is equal to the voltage at both ends of the third resistor. After the weak power supply passes through the first resistor and the fourth resistor, the voltage is input to the second input terminal of the comparator 32, and the voltage at the second input terminal of the comparator 32 is small. Therefore, the voltage at the first input terminal of the comparator 32 is greater than the voltage at the second input terminal, and the comparator 32 outputs the second signal to the controller 10.

[0153] The home appliance may further include a display screen, which may be used to display information such as functions and modes of the home appliance.

[0154] In the present application, the display screen of the household appliance can display information related to the connection relationship between the power plug 20 and the socket.

[0155] Exemplarily, when the user plugs the power plug 20 into the socket, the controller 10 controls the load to start running according to the received second signal, and can also control the display of a prompt message on the display screen, which is used to prompt the user to turn off the household appliance before unplugging the power plug 20 from the socket.

[0156] In this way, during the operation of the household appliance, a prompt message will be displayed on its display screen, which can serve as a certain reminder, so that the user will actively turn off the household appliance before unplugging the power plug 20.

[0157] In the embodiment of the present application, the detection device 21 further includes a light emitting element 24. The position of the light emitting element 24 can be seen in Figure 5 As shown, Figure 5 is a schematic diagram of the position of a light emitting element according to some embodiments.

[0158] like Figure 5As shown, the light emitting element 24 is disposed on the second side of the plug body 22, and the second side of the plug body 22 is the side of the plug body 22 away from the pole piece. The light emitting element 24 can be an LED lamp or other element, and the embodiment of the application does not specifically limit the light emitting element 24.

[0159] The second side of the plug body 22 is as shown in FIG. Figure 5 B side shown.

[0160] Taking the light emitting element 24 as a photodiode as an example, the connection relationship of the light emitting element 24 in the circuit can be seen in Figure 6 As shown, Figure 6 A schematic diagram of a circuit structure of a household appliance including a light-emitting element according to some embodiments.

[0161] like Figure 6 As shown, the first end of the light emitting element 24 is connected to the second end of the first resistor, and the second end of the light emitting element 24 is connected to the negative electrode 231 of the power plug 20 through the touch switch 211. Therefore, the light emitting element 24 is turned on and off by the touch switch 211.

[0162] Exemplarily, when the user unplugs the power plug 20 from the socket, when the distance between the plug body 22 and the socket increases to a first preset distance, the touch switch 211 switches from a closed state to an open state, and the connection between the negative electrode 231 and the second end of the light-emitting element 24 is disconnected, so that the circuit between the weak power supply, the first resistor, the light-emitting element 24 and the negative electrode 231 is disconnected, the weak power supply cannot power the light-emitting element 24, and the light-emitting element 24 is extinguished to prompt the user that the connection between the power plug 20 and the socket is about to be disconnected.

[0163] It is understandable that, since the comparator 32 can be equivalent to a resistor with a larger resistance value, it is much larger than the resistance value of the first resistor and the fourth resistor. Therefore, when the circuit between the weak power supply, the first resistor, the light emitting element 24, and the negative electrode 231 of the power plug 20 is disconnected, the voltage of the second input terminal of the comparator 32 inputted by the weak power supply after passing through the first resistor and the fourth resistor is approximately equal to the voltage of the weak power supply. Therefore, the voltage of the first input terminal of the comparator 32 is less than the voltage of the second input terminal, and the comparator 32 outputs a first signal to the controller 10. The controller 10 controls the load of the household appliance to stop running according to the first signal.

[0164] Exemplarily, when the user plugs the power plug 20 into the socket, when the distance between the plug body 22 and the socket is reduced to a third preset distance, the touch switch 211 is switched from an open state to a closed state, and the negative electrode 231 is connected to the second end of the light-emitting element 24, so that the circuit between the weak power supply, the first resistor, the light-emitting element 24 and the negative electrode 231 is turned on, and the weak power supply supplies power to the light-emitting element 24, so that the light-emitting element 24 emits light to prompt the user that the power plug 20 and the socket are about to be connected.

[0165] It can be understood that when the circuit between the first weak power source, the first resistor, the light emitting element 24 and the negative electrode 231 of the power plug 20 is turned on, the voltage at the second input terminal of the comparator 32 is close to the voltage across the light emitting element 24. Therefore, the voltage at the first input terminal of the comparator 32 is greater than the voltage at the second input terminal, and the comparator 32 outputs a second signal to the controller 10. When the controller 10 receives the second signal, it controls the load to run after the first preset time.

[0166] In this way, by providing the light emitting element 24 on the detection circuit 30 , the user can indicate the connection and disconnection between the power plug 20 and the socket by turning on and off the light emitting element 24 , which has a certain prompting effect on the user.

[0167] In the present application, in addition to the above circuit for detecting that the user wants to plug or unplug the power plug 20, the present application also includes another circuit for detecting that the user unplugs the power plug 20 from the socket. Next, another circuit is described.

[0168] In the present application, the power plug 20 further includes a metal component 25 and a connecting wire 26 .

[0169] The metal element 25 may be a metal sheet or a metal foil, and the embodiment of the present application does not specifically limit the type of the metal element 25 .

[0170] For example, the specific position of the metal element 25 on the power plug 20 can be as follows: Figure 7 As shown, Figure 7 It is a schematic diagram of the setting position of a metal element according to some embodiments.

[0171] like Figure 7 As shown, the metal element 25 is disposed on the side wall of the plug body 22 . The metal element 25 covers part or all of the side wall of the plug body 22 . The side wall is located between the first side and the second side.

[0172] Since metal is a good conductor, according to the principle of electromagnetic induction, when an object with an electromagnetic field contacts the metal element 25, the electromagnetic field of the object will induce a change in charge distribution on the metal element 25. This change in charge distribution is equivalent to generating a weak electrical signal on the metal element 25.

[0173] In this way, when the user touches the power plug 20 with his hand, the user will touch the metal component 25 provided on the power plug 20 .

[0174] In the present application, the household appliance further includes a connecting line 26 . Figure 8 A schematic diagram of a circuit structure of a household appliance including a metal component according to some embodiments.

[0175] like Figure 8 As shown, the metal element 25 is connected to the controller 10 via the connecting wire 26 , and the connecting wire 26 may be a wire insulated from the pole piece of the power plug 20 .

[0176] When an object with an electromagnetic field contacts the metal element 25, the metal element 25 may generate a first electrical signal and transmit the first electrical signal to the controller 10 through the connection line 26. The controller 10 may control the load to stop running according to the first electrical signal.

[0177] The object in the electromagnetic field may be a person or other object, and this embodiment of the present application does not limit this.

[0178] Exemplarily, when the controller 10 controls the load to stop running according to the first electrical signal, the controller 10 may first process the first electrical signal to obtain a processed electrical signal, and control the load to stop running according to the processed electrical signal.

[0179] The processing of the first electrical signal by the controller 10 may include amplification, filtering, etc., which is not limited in the embodiment of the present application.

[0180] In this way, when the user unplugs the power plug 20 from the socket, the user will touch the metal element 25, and the metal element 25 can generate an electrical signal under the influence of the electromagnetic field carried by the user, and transmit the electrical signal to the controller 10, so that the controller 10 can control the load to stop running based on the electrical signal. It is achieved that the load is controlled to stop running when the user touches the power plug 20, which can reduce the situation of arcing when the power plug 20 is unplugged from the socket, and can improve the safety of household appliances.

[0181] In the present application, the household appliance may further include an operational amplifier 40 and a filter circuit 50, such as Fig. 9 As shown, Fig. 9 Schematic diagram of a circuit structure of another household appliance including metal components according to some embodiments.

[0182] like Fig. 9 As shown, a first end of the operational amplifier 40 is connected to the metal sheet via a connecting line 26 , a second end of the operational amplifier 40 is connected to an input end of a filter circuit 50 , and an output end of the filter circuit 50 is connected to the controller 10 .

[0183] The operational amplifier 40 is configured to amplify the first electrical signal to obtain a second electrical signal, and transmit the second electrical signal to the filter circuit 50 .

[0184] In the present application, the operational amplifier 40 can amplify the first electrical signal to obtain an amplified signal, and transmit the amplified signal to the filter circuit 50 .

[0185] Since the electrical signal generated by the metal element 25 is a weak electrical signal, the operational amplifier 40 converts the weak electrical signal into an output signal with greater energy to meet the requirements of subsequent circuits (such as the controller 10) on signal amplitude and power.

[0186] The filter circuit 50 is configured to filter the second electrical signal to obtain a third electrical signal, and transmit the third electrical signal to the controller 10. The filter circuit 50 can filter the received signal amplified by the operational amplifier 40 to obtain a third signal, and transmit the third signal to the controller 10.

[0187] Since the first electrical signal generated by the metal element 25 contains noise, the present application performs filtering processing on the second electrical signal through the filtering circuit 50, which can remove the noise carried in the second electrical signal and make the output third electrical signal purer.

[0188] In this way, the first electrical signal generated by the metal element 25 is processed by the operational amplifier 40 and the filter circuit 50, so that the processed third electrical signal is within a range suitable for processing by the controller 10, which can improve the accuracy of the operation performed by the controller 10 on the third electrical signal.

[0189] The controller 10 is configured to control the load to stop running according to the third electrical signal.

[0190] Exemplarily, for a household appliance in working state, when the user unplugs the power plug 20 from the socket, the user's hand will first touch the metal element 25 on the power plug 20. Since the user carries an electromagnetic field, the metal element 25 can generate a first electrical signal under the influence of the electromagnetic field carried by the user, and transmit the first electrical signal to the operational amplifier 40 through the connecting line 26. The operational amplifier 40 amplifies the first electrical signal to obtain a second electrical signal, and transmits the second electrical signal to the filter circuit 50. The filter circuit 50 filters the second electrical signal to obtain a third electrical signal, and transmits the third electrical signal to the controller 10. The controller 10 controls the load to stop running according to the third electrical signal.

[0191] In this way, when the user unplugs the power plug 20 from the socket, the user will touch the metal element 25 on the power plug 20, and the controller 10 will control the load of the household appliance to stop running, so that the load is controlled to stop running before the connection between the power plug 20 and the socket is disconnected. This ensures that the load of the household appliance is in a stopped state when the power plug 20 is disconnected from the socket, which can avoid the occurrence of electric arcs when the user unplugs the power plug 20, thereby further improving safety.

[0192] In the embodiment of the present application, the specific circuit structure of the operational amplifier 40 and the filter circuit 50 can be seen in Fig.10 As shown, Fig.10 Schematic diagram of a circuit structure between a metal element and a controller according to some embodiments.

[0193] It should be noted that Fig.10 The power supplies in the system are all weak current power supplies.

[0194] In the present application, the sensitivity of the controller 10 to the electrical signal is adjustable, and the sensitivity adjustment method may include the following methods:

[0195] The user can adjust the sensitivity through the buttons or display screen on the household appliance. The specific operation of adjusting the sensitivity is not limited in the embodiment of the present application.

[0196] Exemplarily, the sensitivity is adjusted by adjusting the range of the electrical signal in the controller 10. For example, the user can independently set the range of the electrical signal, and a range is also preset when the household appliance leaves the factory.

[0197] Since objects with electromagnetic fields include not only humans, but also pets in the home, or dust, etc., by adjusting the sensitivity of the controller 10 to the third electrical signal, the controller 10 controls the load of the household appliance to stop running based on the electrical signal only when it receives the electrical signal within the range generated based on the electromagnetic field of the human body. This can avoid the situation where the controller 10 controls the load of the household appliance to stop running based on other objects with electromagnetic fields, thereby improving the accuracy of controlling the household appliance to stop running through the metal element 25.

[0198] Exemplarily, when the controller 10 receives the third electrical signal, it can determine whether the third electrical signal is within a preset range. If the third electrical signal is within the preset range, the load is controlled to stop running according to the third electrical signal.

[0199] The preset range may be a range corresponding to the electromagnetic field of the user, and the embodiment of the present application does not specifically limit the preset range.

[0200] In this way, by setting the range of the electrical signal to the range of the electrical signal generated by the electromagnetic field of the human body, the controller 10 can reduce the possibility of misjudgment when objects other than humans touch the metal element 25, thereby improving the accuracy of the controller 10 in controlling the load to stop running.

[0201] In the present application, the household appliance further comprises a display screen. When the controller 10 receives the third electrical signal, in addition to controlling the load to stop running, it can also control the display screen to display a first prompt message, the first prompt message being used to prompt the user to perform a safety check on the household appliance.

[0202] In this way, it is possible to further avoid the situation where the controller 10 makes a wrong judgment, thereby improving the accuracy of the controller 10 in controlling the load to stop running.

[0203] Combining the above two methods of detecting that the user is about to operate the plug by the detection device 21 and the metal element 25, the following describes how the controller 10 controls the operation of the load.

[0204] In a possible implementation, when the controller 10 receives the first signal and the third electrical signal, the load is controlled to stop running.

[0205] In this way, the controller 10 controls the load to stop running only when receiving the two signals, which can improve the accuracy of determining the situation where the user is about to unplug the power plug 20 from the socket.

[0206] In another possible implementation, when the controller 10 controls the load to stop running according to the third electrical signal, after the second preset time, it can detect whether the first signal and the third electrical signal exist. If the first signal and / or the third electrical signal do not exist, it can be indicated that the third electrical signal detected by the controller 10 is not generated when the user unplugs the plug, and the load is controlled to run, and the first prompt information is output.

[0207] In this way, the accuracy of the controller 10 in controlling the load can be improved.

[0208] In another possible implementation, when the controller 10 controls the load to stop running according to the first signal, after the second preset time, the controller 10 can detect whether there is voltage input from the pole piece of the power plug 20. If there is voltage input from the pole piece of the power plug 20, the load is controlled to run, and a second prompt message is output, and the second prompt message prompts the user to check the connection between the power plug 20 and the socket.

[0209] Since when the load is controlled to stop running according to the first signal, the first signal is generated by a loose plug rather than by manually pulling out the plug, it is possible to detect whether there is voltage input. When there is voltage input, it indicates that the plug may be loose, so the load can be controlled to continue running and the user can be prompted, thereby improving the user experience.

[0210] The above describes the results and control method of the household appliance of the present application. Next, the control method of the household appliance will be explained from the user's perspective.

[0211] The household appliance provided in the present application includes a controller, a load, a plug body and a detection unit.

[0212] Wherein, the load is electrically connected to the controller.

[0213] The plug body is configured to control the operation of the load through the controller when connected to a power source.

[0214] The detection unit is connected to the plug body and the controller, and is configured to output a first signal to the controller when the distance between the plug body and the socket increases to a first preset distance during the process of the user unplugging the plug body from the socket.

[0215] The detection unit may include the detection device and the detection circuit described in the above embodiments. For details, please refer to the above embodiments, and the embodiments of the present application will not be described in detail here.

[0216] When receiving the first signal, the controller controls the load to stop running.

[0217] A possible scenario during the reuse of the household appliance is: when the user wants to unplug the plug body from the socket, the distance between the plug body and the socket gradually increases during the process of the user unplugging the plug body. When the distance between the plug body and the socket increases to a first preset distance, the detection unit sends a first signal to the controller.

[0218] When the controller receives the first signal, it can control the load to stop running according to the first signal.

[0219] In this way, when the user unplugs the plug body from the socket and the connection between the socket and the pole piece of the power plug still exists, the controller will control the load to stop running, so that the load is in a stopped state at the moment the connection between the socket and the pole piece of the power plug is disconnected, thereby avoiding the generation of electric arc.

[0220] The present application also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores computer execution instructions, which are used to implement the technical solution shown in the above method embodiment when executed by a computer.

[0221] The present application also provides a program product, which includes execution instructions stored in a readable storage medium. When the computer program is executed by a computer, the technical solution shown in the above method embodiment is executed. The specific implementation method and technical effect are similar and will not be repeated here.

[0222] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0223] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

[0224] In this application, "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article indicates that the associated objects before and after are in an "or" relationship.

[0225] "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c, a and b, a and c, b and c, or a, b and c, where each of a, b, c can be an element itself or a set containing one or more elements.

[0226] In this application, "at least one" means one or more. "Multiple" means two or more. The first, second, etc. descriptions that appear in the embodiments of this application are only used for illustration and distinction of the described objects. There is no order, nor does it represent a special limitation on the number of devices in the embodiments of this application, and cannot constitute any limitation on the embodiments of this application. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and do not represent the difference in size, priority or importance of the two thresholds.

[0227] In this application, "exemplary", "in some embodiments", "in other embodiments", etc. are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0228] In this application, "of", "corresponding, relevant", "corresponding", and "associated" can sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, the meanings they express are consistent. In the embodiments of this application, communication and transmission can sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, the meanings they express are consistent. For example, transmission can include sending and / or receiving, which can be a noun or a verb.

[0229] In this application, "equal to" can be used in conjunction with "less than" or "greater than", but not with both "less than" and "greater than". When "equal to" is used in conjunction with "less than", it is applicable to the technical solution adopted by "less than". When "equal to" is used in conjunction with "greater than", it is applicable to the technical solution adopted by "greater than".

Claims

1. A household appliance, characterized in that: include: Controller; a load, the load being electrically connected to the controller; Power plug; Plug body; A negative electrode sheet, disposed on a first side of the plug body; A detection device, disposed on the first side of the plug body, and the length of the detection device is shorter than the pole piece; A detection circuit, wherein a first end of the detection circuit is connected to the negative electrode of the power plug through the detection device, and a second end of the detection circuit is connected to the controller; The detection device is configured to disconnect the negative electrode sheet from the detection circuit when the distance between the plug body and the socket increases to a first preset distance; The detection circuit is configured to output a first signal to the controller when the connection between the negative electrode sheet and the detection circuit is disconnected; The controller is configured to control the load to stop running according to the first signal when receiving the first signal.

2. The household appliance according to claim 1, characterized in that: The detection device comprises a touch switch; The distance between the touch switch and the negative electrode sheet is less than or equal to a second preset distance; The touch switch is configured to switch from a closed state to an open state when the distance between the plug body and the socket increases to a first preset distance, so that the connection between the negative electrode sheet and the detection circuit is disconnected.

3. The household appliance according to claim 2, characterized in that: The detection circuit includes a power supply circuit and a comparator; The first end of the power supply circuit is connected to the first input end of the comparator, the second end of the power supply circuit is connected to the second input end of the comparator, the third end of the power supply circuit is connected to the negative electrode sheet through the touch switch, and the output end of the comparator is connected to the controller; The touch switch is configured to switch from a closed state to an open state when the distance between the plug body and the socket increases to a first preset distance, so that the connection between the negative electrode sheet and the third end of the power supply circuit is disconnected; The comparator is configured to output the first signal to the controller when the connection between the negative electrode sheet and the third end of the power supply circuit is disconnected.

4. The household appliance according to claim 3, characterized in that: The power supply circuit comprises: A weak current power supply, a first resistor, a second resistor, a third resistor, and a fourth resistor; The weak current power supply is connected to the first end of the first resistor and the first end of the second resistor respectively, the second end of the second resistor is connected to the first input end of the comparator and the first end of the third resistor respectively, and the second end of the third resistor is grounded; the second end of the fourth resistor is connected to the second input end of the comparator; The second end of the first resistor is connected to the first end of the fourth resistor, and the second end of the first resistor is also connected to the negative electrode sheet through the touch switch.

5. The household appliance according to claim 4, characterized in that: The detection device further comprises a light emitting element, wherein the light emitting element is arranged on a second side of the plug body, and the second side of the plug body is a side of the plug body away from the pole piece; The first end of the light emitting element is connected to the second end of the first resistor, and the second end of the light emitting element is connected to the negative electrode sheet through the touch switch; The light emitting element is configured to be extinguished when the distance between the plug body and the socket increases to the first preset distance.

6. The household appliance according to claim 5, characterized in that: The touch switch is further configured to switch from an open state to a closed state when the distance between the plug body and the socket is reduced to a third preset distance, connecting the cathode plate and the second end of the light-emitting element, so that the light-emitting element emits light; The comparator is further configured to output a second signal to the controller when the cathode plate is connected to the second end of the light emitting element; The controller is further configured to control the load to operate after a first preset time period when the second signal is received.

7. The household appliance according to any one of claims 1 to 6, characterized in that: The power plug also includes: a metal element disposed on a side wall of the plug body, the metal element covering part or all of the side wall of the plug body, the side wall being located between the first side and the second side; A connecting wire, a first end of which is connected to the metal element, and a second end of which is connected to the controller; The metal element is configured to generate a first electrical signal when an object with an electromagnetic field contacts the metal element, and transmit the first electrical signal to the controller through the connecting line; The controller is further configured to control the load to stop running according to the first electrical signal.

8. The household appliance according to claim 7, characterized in that: The household appliance further comprises: Operational amplifiers and filter circuits; The first end of the operational amplifier is connected to the metal sheet through the connecting line, the second end of the operational amplifier is connected to the input end of the filter circuit, and the output end of the filter circuit is connected to the controller; The operational amplifier is configured to amplify the first electrical signal to obtain a second electrical signal, and transmit the second electrical signal to the filter circuit; The filtering circuit is configured to filter the second electrical signal to obtain a third electrical signal, and transmit the third electrical signal to the controller; The controller is configured to control the load to stop running according to the third electrical signal.

9. The household appliance according to claim 8, characterized in that: The controller is further configured to: When the first signal and the third electrical signal are received, controlling the load to stop running; The household appliance further comprises a display screen; The controller is further configured to control displaying a first prompt message on the display screen when receiving the third electrical signal, wherein the first prompt message is used to prompt a user to perform a safety check on the household appliance; The controller is further configured to: When the load is controlled to stop running according to the third electrical signal, after a second preset time period, detecting whether the first signal and the third electrical signal exist; If the first signal and / or the third electrical signal do not exist, controlling the load to run and outputting the first prompt information; The controller is further configured to: When the load is controlled to stop running according to the first signal, after a second preset time, detecting whether there is voltage input from the pole piece of the power plug; If voltage is input from the pole piece of the power plug, the load is controlled to run and a second prompt message is output, wherein the second prompt message prompts the user to check the connection between the power plug and the socket.

10. A household appliance, characterized in that: include: Controller; a load, electrically connected to the controller; The plug body is configured to control the operation of the load through the controller when connected to a power source; a detection unit connected to the plug body and the controller, and configured to output a first signal to the controller when the distance between the plug body and the socket increases to a first preset distance during a process in which a user unplugs the plug body from the socket; When receiving the first signal, the controller controls the load to stop running.

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