Household electrical appliance

Abstract

The embodiment of the invention belongs to the circuit technology, and provides a household appliance which comprises a control device, a switching signal conversion device, a first switch and a tested device. The control device determines the state of the tested device based on the mode of the second switch; the disconnection mode of the second switch and the conduction mode of the first switch are both used for representing that the tested device is in a first state, and the conduction mode of the second switch and the disconnection mode of the first switch are both used for representing that the tested device is in a second state; the switching signal conversion device is used for outputting a first switching signal indicating that the second switch is in an off mode to the control device when the first switch is in the on mode; when the first switch is in the OFF mode, a second switching signal indicating that the second switch is in the ON mode is output to the control device. According to the invention, the compatibility of the household appliance to different types of switches can be improved, and the field production and maintenance efficiency of the household appliance can be improved.

Description

Technical Field

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

[0002] When different types of switches are used in different household appliances, the signals represented when the switch is open or closed may also be different. Take the cylindrical switch and reed switch that can be used as the door switch of the refrigerator as an example. When the cylindrical switch is open, it means that the refrigerator door is closed; when the cylindrical switch is closed, it means that the refrigerator door is open. On the contrary, when the reed switch is open, it means that the refrigerator door is open; when the reed switch is closed, it means that the refrigerator door is closed.

[0003] In the switch circuit of an existing household appliance (such as the above refrigerator), different types of switches represent different contents when opened or closed, so different types of main control boards need to be configured for the household appliance according to different types of switches. However, configuring different types of main control boards may make the on-site production of the household appliance (for example, two different types of main control boards need to be produced) and the maintenance of the household appliance more difficult and less efficient. Summary of the invention

[0004] The embodiment of the present application provides a household appliance, which can improve the compatibility of the household appliance with different types of switches, thereby reducing the difficulty of on-site production and maintenance of the household appliance and improving efficiency.

[0005] In a first aspect, an embodiment of the present application provides a household appliance comprising: a control device, a switch signal conversion device, a first switch, and a device under test; the control device is connected to one end of the first switch through the switch signal conversion device, and the other end of the first switch is connected to the device under test;

[0006] The logic of the control device determining the state of the device under test includes: determining the state of the device under test based on the mode of the second switch; the disconnection mode of the second switch and the conduction mode of the first switch are both used to indicate that the device under test is in the first state, and the conduction mode of the second switch and the disconnection mode of the first switch are both used to indicate that the device under test is in the second state;

[0007] The switch signal conversion device is used to output a first switch signal indicating that the second switch is in an off mode to the control device when the first switch is in an on mode; and to output a second switch signal indicating that the second switch is in an on mode to the control device when the first switch is in an off mode.

[0008] The household appliance provided by the present application, in which the logic of the control device includes determining the state of the device under test based on the mode of the second switch, however, when the switch included in the household appliance for characterizing the state of the device under test is the first switch, the household appliance can, through the switch signal conversion device, when the first switch is in the on-mode, output to the control device a first switch signal indicating that the second switch is in the off-mode, thereby converting the signal of the first switch in the on-mode into the first switch signal; when the first switch is in the off-mode, output to the control device a second switch signal indicating that the second switch is in the on-mode, thereby converting the signal of the first switch in the off-mode into the second switch signal, thereby enabling the control device to still determine the state of the device under test based on the mode of the second switch. Through the above method, the household appliance can be configured with a control device, and there is no need to configure control devices with different logics for different types of switches, thereby improving the compatibility of the control device with switch types, thereby reducing the difficulty of on-site production and maintenance of household appliances, and improving the efficiency of production and maintenance of household appliances.

[0009] In some embodiments of the present application, the switch signal conversion device includes: a first switch module, a second switch module, and a first connection module; the first end of the first switch module is connected to the first end of the first switch, the first end of the second switch module is connected to the second end of the first switch, and the first end of the first connection module is connected, and the second ends of the first switch module and the second switch module are both connected to the second end of the first connection module; the third end of the first connection module is connected to the control device;

[0010] When the first switch is in the conduction mode, the first switch module is turned on, and the second switch module is turned off, so that the switch signal conversion device outputs the first switch signal to the control device through the first connection module;

[0011] When the first switch is in the disconnection mode, the first switch module is disconnected and the second switch module is turned on, so that the switch signal conversion device outputs the second switch signal to the control device through the first connection module.

[0012] In some embodiments of the present application, the first switch module is a first triode, the second switch module is a second triode, and the switch signal conversion device further includes: a first voltage-dividing resistor;

[0013] The base and collector of the first transistor are both connected to the second end of the first connection module, and the emitter of the first transistor is connected to the first end of the first switch; the base of the second transistor is connected to the collector of the first transistor, and the collector of the second transistor is connected to the second end of the first connection module through the first voltage-dividing resistor; the emitter of the second transistor is connected to the second end of the first switch and the first end of the first connection module.

[0014] In some embodiments of the present application, the switching signal conversion device also includes: a first current limiting resistor, and a second current limiting resistor, the collector of the first transistor is connected to the second end of the first connection module through the first current limiting resistor; the base of the first transistor is connected to the second end of the first connection module through the second current limiting resistor.

[0015] In some embodiments of the present application, the household appliance further includes: a detection device, the detection device including: a second connection module, and a second voltage-dividing resistor; the first end of the second voltage-dividing resistor is connected to the target voltage output end, the second end of the second voltage-dividing resistor is connected to the control device, and is connected to the second end of the switch signal conversion device through the first end of the second connection module, and the second end of the second connection module and the first end of the switch signal conversion device are both grounded.

[0016] In some embodiments of the present application, the detection device also includes: a third current limiting resistor and a filtering module, the second end of the second voltage dividing resistor is connected to the control device through the third current limiting resistor, the third current limiting resistor and the control device are connected to the first end of the filtering module, and the second end of the filtering module and the second end of the second connection module are both grounded.

[0017] In some embodiments of the present application, if the household appliance does not include: the switch signal conversion device and the first switch, and includes the second switch, then the first end of the second switch is connected to the first end of the second connection module, and the second end of the second switch is connected to the second end of the second connection module.

[0018] In some embodiments of the present application, the device under test is a door body, the first switch and the second switch are both door switches of the door body; the first state of the device under test is that the door body is closed, and the second state of the device under test is that the door body is open.

[0019] In some embodiments of the present application, the second switch is a cylindrical switch, and the first switch is a reed switch.

[0020] In some embodiments of the present application, the household appliance is a refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 A schematic diagram of the structure of a household appliance provided in this application;

[0023] Figure 2 A schematic diagram of the structure of a switch signal conversion device provided in this application;

[0024] Figure 3 A schematic diagram of the structure of another switch signal conversion device provided in the present application;

[0025] Figure 4 A schematic diagram of the structure of another household appliance provided for this application;

[0026] Figure 5 A structural schematic diagram of another household appliance provided by the present application;

[0027] Figure 6 A schematic diagram of a main control board detection circuit provided in this application;

[0028] Figure 7 A schematic diagram of a circuit for detecting a switch signal of a cylindrical switch provided in the present application;

[0029] Figure 8 A schematic diagram of a circuit for detecting a switch signal of a reed switch provided in the present application. DETAILED DESCRIPTION

[0030] 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.

[0031] 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 ordinary and common meanings.

[0032] 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 expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0033] With the development of science and technology, the types of switches are becoming more and more diverse. Different types of switches, when used in different scenarios, may also produce different signals when the switch is open or closed. Take the cylindrical switch that can be used as a refrigerator door switch and the reed switch as examples. The signals representing these two types of switches can be shown in Table 1 below:

[0034] Table 1

[0035]

[0036] As shown in Table 1, due to cost and generalization, the cylindrical switch is a normally closed contact. That is, when the refrigerator door is open, the cylindrical switch contact is closed, and when the door is closed, the cylindrical switch contact is disconnected; the reed switch is a normally open contact, that is, when the refrigerator door is open, the reed switch contact is disconnected, and when the door is closed, the reed switch contact is closed.

[0037] However, because different types of switches represent different contents when they are open or closed, it is required that the home appliances using different switches have different main control boards. For example, taking a refrigerator using a column switch as a door switch as an example, the main control board of the refrigerator is a main control board 1 that can determine that the refrigerator door is closed when the column switch is open, and determine that the refrigerator door is open when the column switch is closed. Taking a refrigerator using a reed switch as a door switch as an example, the main control board of the refrigerator is a main control board 2 that can determine that the refrigerator door is open when the reed switch is open, and determine that the refrigerator door is closed when the reed switch is closed.

[0038] That is to say, in the switch circuit of an existing household appliance (such as the above refrigerator), different types of main control boards need to be configured for the household appliance according to different types of switches. However, configuring different types of main control boards may make the on-site production of the household appliance (for example, two different types of main control boards need to be produced) and the maintenance of the household appliance more difficult and less efficient.

[0039] Considering the above problems existing in the existing switch circuit, the present application proposes a switch circuit that is compatible with different types of switches to improve the compatibility of the main control board with switch types. Through the switch circuit, for the same household appliance, even if the control device of the household appliance can be configured with different types of switches, only one type of main control board needs to be configured for the household appliance, thereby improving the compatibility of the main control board with switch types, thereby reducing the difficulty of on-site production and maintenance of household appliances, and improving the efficiency of production and maintenance of household appliances.

[0040] It should be understood that the present application does not limit the types of the above-mentioned home appliances. For example, the home appliance can be any home appliance such as a refrigerator, a smart wine cabinet, a living room bar cabinet, etc.

[0041] Figure 1 This is a schematic diagram of the structure of a household appliance provided in this application. Figure 1 As shown, the household appliance may include: a control device, a switch signal conversion device, a first switch, and a device under test. The control device may be connected to one end of the first switch through the switch signal conversion device. The other end of the first switch may be connected to the device under test.

[0042] The logic for the control device to determine the state of the device under test may include: determining the state of the device under test based on the mode of the second switch. The disconnection mode of the second switch and the conduction mode of the first switch may both be used to characterize that the device under test is in the first state. The conduction mode of the second switch and the disconnection mode of the first switch may both be used to characterize that the device under test is in the second state.

[0043] Optionally, as mentioned above, the household appliance can be any household appliance such as a refrigerator, a smart wine cabinet, a living room bar cabinet, etc. Optionally, the device under test can be any device such as a door body, a pull-out box (or a drawer) that can characterize its state through the disconnection mode and the conduction mode of the switch, and this application does not limit this.

[0044] Exemplarily, taking the device under test as a door body as an example, the first switch and the second switch may both be door switches of the door body. The first state of the device under test may be that the door body is closed, and the second state of the device under test may be that the door body is open. Alternatively, the first state of the device under test may be that the door body is open, and the second state of the device under test may be that the door body is closed. Exemplarily, the second switch may be, for example, a cylindrical switch, and the first switch may be, for example, a reed switch. Alternatively, the door switch may also be any other existing type of door switch, which is not limited in the present application. Taking the household appliance as a refrigerator as an example, the device under test may be the door body of the refrigerator (such as the door body of a refrigerator compartment or the door body of a freezer compartment).

[0045] Taking the device under test as a drawer box as an example, the first state of the device under test may be, for example, that the drawer box is not drawn out, and the second state of the device under test may be, for example, that the drawer box is drawn out. Exemplarily, the first switch used to characterize the first state and the second state of the drawer box may also be, for example, a reed switch, and the second switch may also be, for example, a cylindrical switch.

[0046] Optionally, the control device may be, for example, the aforementioned main control board, or any control device with processing functions such as a microcontroller unit (MCU). It should be understood that the present application does not limit how the control device determines the state of the device under test based on the mode of the second switch, and how to use the state of the device under test after determining the state of the device under test.

[0047] The switch signal conversion device can be used to output a first switch signal indicating that the second switch is in an off mode to the control device when the first switch is in an on mode. Therefore, the control device can determine that the device under test is in the first state according to the first switch signal indicating that the second switch is in an off mode.

[0048] The switch signal conversion device can be used to output a second switch signal indicating that the second switch is in the on mode to the control device when the first switch is in the off mode. Therefore, the control device can determine that the device under test is in the second state according to the second switch signal indicating that the second switch is in the on mode.

[0049] That is to say, the switch signal conversion device can realize: converting the switch signal used to characterize that the switch is in the on mode into the switch signal used to characterize that the switch is in the off mode; and converting the switch signal used to characterize that the switch is in the off mode into the switch signal used to characterize that the switch is in the on mode.

[0050] Exemplarily, the first switch signal may be, for example, a high-level signal, and the second switch signal may be, for example, a low-level signal. Taking the first switch signal as a low-level signal as an example, the second switch signal may be, for example, a high-level signal. Alternatively, the first switch signal may be, for example, a first preset voltage value (or current, etc.), and the second switch signal may be, for example, a second preset voltage value (or current, etc.).

[0051] In this embodiment, when the logic of the control device includes determining the state of the device under test based on the mode of the second switch, and the switch included in the household appliance for characterizing the state of the device under test is the first switch, the household appliance can output a first switch signal indicating that the second switch is in an off mode to the control device through a switch signal conversion device when the first switch is in an on mode, thereby converting the signal of the first switch in the on mode to the first switch signal; when the first switch is in an off mode, output a second switch signal indicating that the second switch is in the on mode to the control device, thereby converting the signal of the first switch in the off mode to the second switch signal, thereby enabling the control device to still determine the state of the device under test based on the mode of the second switch. Through the above method, the household appliance can be configured with a control device, and there is no need to configure control devices with different logics for different types of switches, thereby improving the compatibility of the control device with switch types, thereby reducing the difficulty of on-site production and maintenance of household appliances, and improving the efficiency of production and maintenance of household appliances.

[0052] The structure of the switch signal conversion device is described in detail below:

[0053] Figure 2 This is a schematic diagram of the structure of a switch signal conversion device provided in this application. Figure 2 As shown, as a possible implementation, the switch signal conversion device may include: a first switch module, a second switch module, and a first connection module. The first end of the first switch module may be connected to the first end of the first switch. The first end of the second switch module may be connected to the second end of the first switch and the first end of the first connection module. The second end of the first switch module and the second end of the second switch module may both be connected to the second end of the first connection module. The third end of the first connection module may be connected to the above-mentioned control device.

[0054] In this implementation, when the first switch is in the on mode, the first switch module can be turned on, and the second switch module can be turned off, so that the switch signal conversion device outputs the first switch signal to the control device through the first connection module. When the first switch is in the off mode, the first switch module can be turned off, and the second switch module can be turned on, so that the switch signal conversion device outputs the second switch signal to the control device through the first connection module.

[0055] Exemplarily, the first switch module and the second switch module may include switch components such as transistors. It should be understood that the present application does not limit the number and type of switch components included in the first switch module and the second switch module.

[0056] Exemplarily, the first connection module may be a component having a circuit connection function, such as a socket component.

[0057] In this embodiment, the switch signal conversion device and the control device are connected through the first connection module, thereby improving the flexibility of the household appliance. Through the first switch module and the second switch module, the switch signal conversion device can convert the signal of the first switch in the disconnection mode into the second switch signal when the first switch is in the disconnection mode, and convert the signal of the first switch in the conduction mode into the first switch signal when the first switch is in the conduction mode, thereby laying a foundation for the control device to determine the state of the device under test based on the mode of the second switch.

[0058] Taking the above-mentioned first switch module as the first transistor and the second switch module as the second transistor as an example, Figure 3 This is a schematic diagram of the structure of another switch signal conversion device provided by the present application. Figure 3 As shown, in some embodiments, the switch signal conversion device may further include: a first voltage dividing resistor.

[0059] In this implementation, the base and collector of the first triode may be connected to the second end of the first connection module. The emitter of the first triode may be connected to the first end of the first switch. The base of the second triode may be connected to the collector of the first triode. The collector of the second triode may be connected to the second end of the first connection module through the above-mentioned first voltage-dividing resistor. The emitter of the second triode may be connected to the second end of the first switch and the first end of the first connection module.

[0060] Through the above-mentioned first voltage-dividing resistor, the first transistor and the second transistor can obtain the input voltage, so that the first transistor and the second transistor can work normally under the voltage, laying the foundation for the subsequent function of the switching signal conversion device based on the first transistor and the second transistor.

[0061] like Figure 3 As shown, in some embodiments, the switch signal conversion device may further include: a first current limiting resistor, and a second current limiting resistor. The collector of the first transistor may be connected to the second end of the first connection module through the first current limiting resistor. The base of the first transistor may be connected to the second end of the first connection module through the second current limiting resistor.

[0062] It should be understood that the present application does not limit the resistance values ​​of the first voltage-dividing resistor, the first current-limiting resistor, and the second current-limiting resistor.

[0063] The first current limiting resistor and the second current limiting resistor can protect the first transistor and the second transistor from being broken down by excessive current, thereby ensuring the safety and service life of the first transistor and the second transistor, improving the service life and safety of the household appliance, and further improving the user experience.

[0064] Figure 4 This is a schematic diagram of the structure of another household appliance provided in this application. Figure 4 As shown, as a possible implementation, the household appliance may further include: a detection device. The detection device may include: a second connection module, and a second voltage-dividing resistor. The first end of the second voltage-dividing resistor may be connected to the target voltage output end. The second end of the second voltage-dividing resistor may be connected to the control device, and may be connected to the second end of the switch signal conversion device through the first end of the second connection module. The second end of the second connection module and the first end of the switch signal conversion device may both be grounded.

[0065] It should be understood that the present application does not limit the resistance value of the second voltage-dividing resistor. Exemplarily, the second connection module may be a component having a circuit connection function, such as a socket component.

[0066] In addition, it should be understood that the present application does not limit the size of the above-mentioned target voltage, nor the device that outputs the target voltage. Optionally, the household appliance may also include a power module and a voltage conversion module. The power module may be connected to the second voltage-dividing resistor through the voltage conversion module. Among them, the voltage conversion module may convert the output voltage of the power module into the target voltage, and output the target voltage to the second voltage-dividing resistor through the target voltage output terminal of the voltage conversion module. Alternatively, the household appliance may also provide the above-mentioned target voltage to the second voltage-dividing resistor in any existing manner. For example, the second voltage-dividing voltage may also be connected to the target voltage output terminal of the control device to obtain the target voltage from the control device.

[0067] Through the above method, the switch signal conversion device can output the first switch signal or the second switch signal to the control device through the detection device, laying a foundation for the control device to determine the state of the device under test based on the first switch signal or the second switch signal.

[0068] Figure 5 This is a schematic diagram of the structure of another household appliance provided by this application. Figure 5As shown, in some embodiments, the detection device may further include: a third current limiting resistor, and a filtering module. The second end of the second voltage-dividing resistor may be connected to the control device through the third current limiting resistor. The third current limiting resistor and the control device may be connected to the first end of the filtering module. The second end of the filtering module and the second end of the second connection module may both be grounded.

[0069] It should be understood that the present application does not limit the resistance value of the third current limiting resistor. Exemplarily, the filter module can be any existing component with a filtering function, such as a filter capacitor or a filter inductor, and the present application does not limit this.

[0070] The third current limiting resistor ensures the safety and service life of the components in the detection device. The filter module improves the stability of the detection device circuit, further improving the safety and user experience of the home appliance.

[0071] In some embodiments, if the household appliance does not include: the above-mentioned switch signal conversion device and the first switch, and includes a second switch, it means that the above-mentioned control device can directly determine the state of the device under test based on the mode of the second switch, without the need for conversion of the switch signal. Therefore, optionally, the first end of the second switch can be connected to the first end of the second connection module, and the second end of the second switch can be connected to the second end of the second connection module. Through the above method, the control device can obtain the switch signal representing the mode of the second switch through the detection device, and determine the state of the device under test based on the mode of the second switch, thereby improving the compatibility of the control device and improving the flexibility of the household appliance.

[0072] Alternatively, the control device may determine the state of the device under test based on the mode of the second switch by referring to any existing method for determining the state of the device under test based on the switch mode, which will not be described in detail in this application.

[0073] The structure of the household appliance provided in this application is exemplified below by taking the household appliance as a refrigerator, the device under test as the door of the refrigerator, the control device as the MCU of the refrigerator, the first switch as a reed switch, and the second switch as a cylindrical switch as an example. Figure 6 This is a schematic diagram of a main control board detection circuit provided by this application. Figure 6 As shown, the main control board detection circuit may include a detection device and an MCU. Among them, R101 is a second voltage-dividing resistor with a resistance of 10K ohms, R102 is a third current-limiting resistor with a resistance of 2.2K ohms, and C101 is a capacitor with a capacitance of 0.1 μF as a filter module. CN1 is a socket. The above target voltage may be 5V.

[0074] In the detection circuit of the main control board: when pins 1 and 2 at CN1 are disconnected, the level detected by the MCU is a high level; when pins 1 and 2 at CN1 are connected, the level detected by the MCU is a low level.

[0075] If the household appliance does not include: the switch signal conversion device and the reed switch, and includes a cylindrical door switch, Figure 7 This is a schematic diagram of a circuit for detecting a switch signal of a cylindrical switch provided by the present application. Figure 7 The cylindrical switch shown in FIG. 1 can be connected to the socket CN2 as shown in FIG. Figure 6 Because the cylindrical switch is a normally closed contact, when the refrigerator door is opened, the contact of the door switch is closed, and Figure 6 When the refrigerator door is closed, the door switch contacts are disconnected, and the level detected by the MCU is high.

[0076] If the household appliance comprises: the switch signal conversion device and the reed switch, Figure 8 A schematic diagram of a circuit for detecting a switch signal of a reed switch provided in the present application. Figure 8 As shown in , the 2nd pin of the socket CN3 can be connected to the 1st pin of the socket CN1, and the 1st pin of the socket CN3 can be connected to the 2nd pin of the socket CN1. Figure 8 The circuit shown can also be called a switch circuit for the reverse function of the reed switch.

[0077] The reed switch is a normally open contact. When the refrigerator door is opened, the door switch contact is disconnected, at which time the first transistor V302 is not conducting, and the base of the second transistor V301 is at a high level, and at this time V301 is conducting. Figure 6 The 5V level (target voltage) shown in the figure is connected to the Figure 8 The first 100Ω (ohm) voltage-dividing resistor R303 is used for voltage division. At this time, the 2nd pin of CN3 obtained by voltage division is at a low level, and the level detected by the MCU is at a low level. When the refrigerator door is closed, the door switch contact is closed, V302 is turned on, the base of V301 is at a low level, V301 is not turned on, the 2nd pin of CN3 is at a high level, and the level detected by the MCU is at a high level. Through the above method, the MCU level when the door is opened and closed is high and low. Figure 7 The logic of the column switches is consistent, which realizes the universality of the main control board.

[0078] In this embodiment, under the condition of the same main control board, by adding a peripheral circuit (such as the aforementioned switch signal conversion device) on the circuit board of the reed switch, the circuit has a reverse function, so that when the refrigerator door is opened, although the door switch contacts are disconnected, when the door is closed, the door switch contacts are closed, but because of the reverse circuit, the logic signal provided to the main control board is consistent with the column switch, thereby realizing the universalization of the main control board.

[0079] 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.

[0080] For the convenience 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 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.

Claims

1. A household appliance, characterized in that: The household appliance comprises: a control device, a switch signal conversion device, a first switch, and a device under test; the control device is connected to one end of the first switch through the switch signal conversion device, and the other end of the first switch is connected to the device under test; The logic of the control device determining the state of the device under test includes: determining the state of the device under test based on the mode of the second switch; the disconnection mode of the second switch and the conduction mode of the first switch are both used to indicate that the device under test is in the first state, and the conduction mode of the second switch and the disconnection mode of the first switch are both used to indicate that the device under test is in the second state; The switch signal conversion device is used to output a first switch signal indicating that the second switch is in an off mode to the control device when the first switch is in an on mode; and to output a second switch signal indicating that the second switch is in an on mode to the control device when the first switch is in an off mode.

2. The household appliance according to claim 1, characterized in that: The switch signal conversion device comprises: a first switch module, a second switch module, and a first connection module; a first end of the first switch module is connected to a first end of the first switch, a first end of the second switch module is connected to a second end of the first switch, and a first end of the first connection module is connected, and second ends of the first switch module and the second switch module are both connected to a second end of the first connection module; a third end of the first connection module is connected to the control device; When the first switch is in the conduction mode, the first switch module is turned on, and the second switch module is turned off, so that the switch signal conversion device outputs the first switch signal to the control device through the first connection module; When the first switch is in the disconnection mode, the first switch module is disconnected and the second switch module is turned on, so that the switch signal conversion device outputs the second switch signal to the control device through the first connection module.

3. The household appliance according to claim 2, characterized in that: The first switch module is a first triode, the second switch module is a second triode, and the switch signal conversion device further includes: a first voltage-dividing resistor; The base and collector of the first transistor are both connected to the second end of the first connection module, and the emitter of the first transistor is connected to the first end of the first switch; the base of the second transistor is connected to the collector of the first transistor, and the collector of the second transistor is connected to the second end of the first connection module through the first voltage-dividing resistor; the emitter of the second transistor is connected to the second end of the first switch and the first end of the first connection module.

4. The household appliance according to claim 3, characterized in that: The switch signal conversion device also includes: a first current limiting resistor, and a second current limiting resistor, the collector of the first transistor is connected to the second end of the first connection module through the first current limiting resistor; the base of the first transistor is connected to the second end of the first connection module through the second current limiting resistor.

5. The household appliance according to any one of claims 1 to 4, characterized in that: The household appliance also includes: a detection device, which includes: a second connection module, and a second voltage-dividing resistor; the first end of the second voltage-dividing resistor is connected to the target voltage output end, the second end of the second voltage-dividing resistor is connected to the control device, and is connected to the second end of the switch signal conversion device through the first end of the second connection module, and the second end of the second connection module and the first end of the switch signal conversion device are both grounded.

6. The household appliance according to claim 5, characterized in that: The detection device also includes: a third current limiting resistor and a filtering module, the second end of the second voltage-dividing resistor is connected to the control device through the third current limiting resistor, the third current limiting resistor and the control device are connected to the first end of the filtering module, and the second end of the filtering module and the second end of the second connection module are both grounded.

7. The household appliance according to claim 5, characterized in that: If the household appliance does not include: the switch signal conversion device and the first switch, and includes the second switch, the first end of the second switch is connected to the first end of the second connection module, and the second end of the second switch is connected to the second end of the second connection module.

8. The household appliance according to any one of claims 1 to 4, characterized in that: The device under test is a door body, the first switch and the second switch are both door switches of the door body; the first state of the device under test is that the door body is closed, and the second state of the device under test is that the door body is opened.

9. The household appliance according to claim 8, characterized in that: The second switch is a cylindrical switch, and the first switch is a reed switch.

10. The household appliance according to claim 8, characterized in that: The household appliance is a refrigerator.

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