Household appliance

Abstract

According to the household electrical appliance, a power supply supplies power to the household electrical appliance through a power supply line, a detection module, a shell and the power supply line form a detection loop, when the shell is electrified due to short circuit of the shell and the power supply line, the detection module can output an electric signal, and when a controller receives the electric signal, the detection loop is connected with the power supply line. When the shell is electrified, a shell electrification alarm signal is generated and / or the household electrical appliance is controlled to be powered off, so that when the shell is electrified, a power supply is automatically cut off, and / or reminding information is sent in time to avoid electric shock danger when a user contacts, thereby ensuring the safety of the household electrical appliance and personnel; and meanwhile, the isolation module is arranged between the detection module and the shell and is used for performing signal connection and safety isolation between the detection module and the shell, so that the shell can be protected, and the safety of the household appliances and personnel is further ensured.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, and in particular to a household appliance. Background Technology

[0002] Most household appliances use metal casings, especially air conditioners, refrigerators, and washing machines. During installation, the mains power distribution system must have a grounding wire, which is connected to the appliance's casing—this is called protective grounding. However, in reality, there are always situations where users lack grounding, or where the casing grounding fails. In such cases, if the appliance's casing short-circuits due to abnormal reasons, making it live, there is a risk of electric shock when the user touches it, posing a danger to the user.

[0003] To avoid such dangerous situations, some current home appliances are equipped with leakage current detection functions. However, these functions can only detect leakage, and cannot effectively detect or warn users when the casing is only energized but not leaking current, still posing a risk of electric shock. Furthermore, most existing leakage current detection devices directly connect the live mains circuit to the ground wire via a voltage divider circuit. This voltage divider circuit lacks safety isolation components, resulting in insufficient protection for the home appliance and posing a threat to the safety of both the appliance and users. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the purpose of this invention is to provide a household appliance.

[0005] This utility model discloses a household appliance, comprising: a housing; a power supply line connected to a power source; a detection module, one end of which is connected to the housing and the other end of which is connected to the power supply line, the detection module, the housing, and the power supply line forming a detection loop, the detection module being used to detect whether the housing is energized based on the detection loop, and outputting a corresponding electrical signal when the housing is detected to be energized; an isolation module disposed between the detection module and the housing, the isolation module being used for signal connection and safety isolation between the detection module and the housing; and a controller configured to: generate an alarm signal for the housing being energized and / or control the household appliance to cut off power when the electrical signal is received.

[0006] The above technical solution has the following advantages or beneficial effects: According to the embodiment of this utility model, the power supply to the household appliance is provided through the power supply line. The detection module, the housing, and the power supply line form a detection circuit. When the housing becomes energized due to a short circuit with the power supply line, the detection module can output an electrical signal. When the controller receives the electrical signal, it generates an alarm signal for the housing being energized and / or controls the household appliance to cut off the power. Thus, when the housing is energized, the power supply is automatically cut off, and / or a timely reminder message is issued to avoid the risk of electric shock when the user touches it, thereby ensuring the safety of the household appliance and personnel. At the same time, an isolation module is also set between the detection module and the housing. The isolation module is used to connect the detection module and the housing for signal connection and safety isolation, thereby protecting the housing and further ensuring the safety of the household appliance and personnel.

[0007] In addition, the household appliance according to the embodiments of this utility model may also have the following additional technical features:

[0008] Furthermore, the detection module includes an isolation unit, a rectification unit, and a signal conversion unit; wherein, one end of the isolation unit is connected to the power supply line, and the other end of the isolation unit is connected to the housing through either the rectification unit or the signal conversion unit, and the rectification unit and the signal conversion unit are connected.

[0009] The above technical solution has the following advantages or beneficial effects: According to the embodiments of the present utility model, the household appliance uses an isolation unit to connect and safely isolate the signal with the power supply line, uses a rectifier unit to convert the AC signal into a unidirectional DC signal, and uses a signal conversion unit to convert the signal, thereby ensuring that the detection module can detect the liveness of the casing.

[0010] Furthermore, the rectifier unit includes a diode group, and the signal conversion unit includes an optocoupler; wherein, the diode group includes multiple diodes connected in parallel, the input terminal of the diode group is connected to the isolation unit and the housing respectively, the output terminal of the diode group is connected to the input terminal of the optocoupler, and the output terminal of the optocoupler is used to output the electrical signal.

[0011] The above technical solution has the following advantages or beneficial effects: According to the embodiments of the present utility model, the household appliance uses an isolation unit to connect and safely isolate the signal with the power supply line, uses a diode group to convert the AC signal into a unidirectional DC signal, and uses an optocoupler to convert the signal, thereby ensuring that the detection module can detect the energization of the casing.

[0012] Furthermore, the rectifier unit includes a diode group or an operational amplifier with rectification function, and the signal conversion unit includes a transformer; wherein, the diode group includes multiple diodes connected in parallel, the primary coil of the transformer is connected to the isolation unit and the housing respectively, the secondary coil of the transformer is connected to the input terminal of the diode group, and the output terminal of the diode group is used to output the electrical signal; or, the secondary coil of the transformer is connected to the input terminal of the operational amplifier, and the output terminal of the operational amplifier is used to output the electrical signal.

[0013] The above technical solution has the following advantages or beneficial effects: According to the embodiments of the present utility model, the household appliance uses an isolation unit to connect and safely isolate the signal from the power supply line, uses a diode group or an operational amplifier with rectification function to convert the AC signal into a unidirectional DC signal, and uses a transformer to perform signal conversion, thereby ensuring that the detection module can detect the energization of the casing.

[0014] Furthermore, the household appliance also includes a switch module, which is disposed between the housing and the detection module, or between the housing and the detection module; wherein the controller is configured to: control the switch module to close when a live detection command signal is received; or control the switch module to open when no live detection command signal is received.

[0015] The above technical solution has the following advantages or beneficial effects: In the household appliance according to the embodiment of this utility model, the switch module can be located between the housing and the detection module, or between the housing and the detection module. The switch module is used to control the switching of the detection module. When the controller receives a live detection command signal, it controls the switch module to close, thereby actively controlling the activation of the live detection function. When the controller does not receive a live detection command signal, it controls the switch module to open, thereby avoiding the detection module from generating additional leakage current to the housing, which would cause abnormal leakage current when the household appliance is working normally.

[0016] Furthermore, the switching module includes one or more of relays, electron tubes, thyristors, and other electronic switches.

[0017] The above technical solution has the following advantages or beneficial effects: According to the embodiments of the present utility model, the household appliance switching module includes one or more of relays, electron tubes, thyristors and other electronic switches, and the switching module can control the switching of the detection module according to the instructions of the controller.

[0018] Furthermore, the switch module includes a single-channel switch, one end of which is connected to the detection module, and the other end of which is connected to the neutral wire of the power supply line.

[0019] The above technical solution has the following advantages or beneficial effects: According to the household appliance of the present utility model embodiment, the switch module includes a single-circuit switch, one end of the single-circuit switch is connected to the detection module, and the other end of the single-circuit switch is connected to the neutral wire of the power supply line, so that the detection module can determine whether the shell is energized.

[0020] Furthermore, the switch module includes a dual-channel switch, one end of which is connected to the detection module, the first channel of the other end of which is connected to the neutral wire of the power supply line, and the second channel of the other end of which is connected to the live wire of the power supply line.

[0021] The above technical solution has the following advantages or beneficial effects: According to the household appliance of the present utility model embodiment, the switch module includes a dual-circuit switch, one end of the dual-circuit switch is connected to the detection module, the first circuit of the other end of the dual-circuit switch is connected to the neutral wire of the power supply line, and the second circuit of the other end of the dual-circuit switch is connected to the live wire of the power supply line. Thus, the detection module can not only determine whether the shell is energized according to the detection circuit, but also locate the wire with a short circuit, which is convenient for corresponding repair or replacement.

[0022] Furthermore, the household appliance also includes a surge protection module, which is connected to the input terminal of the detection module and is used to limit the voltage flowing into the detection module.

[0023] The above technical solution has the following advantages or beneficial effects: According to the embodiment of the present utility model, the household appliance is also connected to the input end of the detection module. The surge protection module limits the voltage value flowing into the detection module and suppresses the surge current generated at the moment the power is turned on, thereby protecting the detection module from damage and ensuring the normal operation of the detection function.

[0024] Furthermore, the surge protection module includes one or more of a varistor, a gas discharge tube, a transient voltage suppression tube, and an organic varistor.

[0025] The above technical solution has the following advantages or beneficial effects: According to the household appliance of the present utility model embodiment, the surge protection module includes one or more of a varistor, a gas discharge tube, a transient voltage suppression tube, and an organic varistor. The surge protection module can limit the voltage value flowing into the detection module and suppress the surge current generated at the moment the power is turned on, thereby protecting the detection module from damage and ensuring the normal operation of the detection function.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of the structure of a household appliance according to an embodiment of the present utility model;

[0029] Figure 2 This is a schematic diagram of the hardware structure of a controller according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of a detection module according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of a detection module according to an additional embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of a detection module according to another embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of a detection module according to another additional embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of a household appliance according to another embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the structure of a household appliance according to another additional embodiment of the present invention;

[0036] Figure 9 This is a structural schematic diagram of a household appliance according to another additional embodiment of the present invention;

[0037] Figure 10 This is a structural schematic diagram of a household appliance according to another embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of the structure of a household appliance according to a specific embodiment of the present utility model;

[0039] Figure 12 This is a structural schematic diagram of a household appliance according to another specific embodiment of the present utility model.

[0040] Figure label:

[0041] Home appliance - 10; Housing - 11; Power supply line - 12; Detection module - 13; Isolation module - 14; Switching module - 15; Surge protection module - 16;

[0042] Controller-71; Bus-81; Memory-82; Processor-83; Communication Interface-84;

[0043] Isolation unit-131; Rectifier unit-132; Signal conversion unit-133. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] In existing technology, the neutral wire (N) of a power supply system ideally has zero voltage and is called the neutral line. Due to the actual imbalance of power consumption in the power grid, the neutral wire (N) also has a voltage value, but it is generally quite low. Therefore, even if the neutral wire (N) is connected to the casing, its safety hazard is much lower. However, when the neutral and live wires are connected incorrectly or the power grid is severely unbalanced, the neutral wire voltage can pose a significant safety hazard. For safety reasons, a short circuit between the casing and the neutral wire (N) or the live wire (L) is considered unsafe, as it will cause the casing of the appliance to become live when it is operating, making the casing a source of safety hazard.

[0049] To address the problems in existing technologies, this utility model provides a household appliance that can detect the electrical charge on the casing. The following is a reference to... Figures 1-12 This invention describes a household appliance according to an embodiment of the present invention.

[0050] Figure 1 This is a structural schematic diagram of a household appliance according to an embodiment of the present invention. Figure 1 As shown, a household appliance 10 includes: a housing 11; a power supply line 12 connected to a power source; a detection module 13, one end of which is connected to the housing 11 and the other end of which is connected to the power supply line 12, the detection module 13, the housing 11, and the power supply line 12 forming a detection loop, the detection module 13 being used to detect whether the housing 11 is energized based on the detection loop, and outputting a corresponding electrical signal when the housing 11 is detected to be energized; an isolation module 14 disposed between the detection module 13 and the housing 11, the isolation module 14 being used for signal connection and safety isolation between the detection module 13 and the housing 11; and a controller 71 configured to generate an alarm signal for the housing being energized and / or control the household appliance 10 to disconnect power when an electrical signal is received.

[0051] In a specific embodiment, the household appliance 10 is, for example, an air conditioner, a refrigerator, a washing machine, or other household appliances with metal casings. The power supply is, for example, mains power or a test power supply. The power supply supplies power to the household appliance 10 through the power supply line 12, which includes a live wire L and a neutral wire N.

[0052] In a specific embodiment, the household appliance 10 further includes a detection module 13 and a controller 71. The detection module 13 is connected at both ends to the housing 11 and the power supply line 12, respectively. The detection module 13, housing 11, and power supply line 12 form a detection circuit. When the housing 11 becomes energized due to a short circuit with the power supply line 12, the detection module 13 can output an electrical signal. Upon receiving the electrical signal, the controller 71 generates an alarm signal indicating that the housing is energized and / or controls the household appliance 10 to disconnect from the power supply. This automatically cuts off the power supply when the housing 11 is energized and / or promptly issues a warning message to avoid the risk of electric shock when the user touches it, thereby ensuring the safety of the household appliance 10 and personnel. Specifically, the warning message may include, but is not limited to, alarm sound signals and photoelectric signals.

[0053] In a specific embodiment, the detection module 13 includes an isolation transmission signal device, which can be an isolation transformer, optocoupler, opto-isolated operational amplifier, magnetically coupled isolation amplifier, or other isolation transmission signal device. There are many circuit topologies that can implement the detection module 13. To avoid introducing abnormal interference signals from the power grid, an isolation detection scheme is generally adopted. The detection module 13 is used to detect and determine whether there is a short circuit connection between the live wire L, the neutral wire N, and the housing 11.

[0054] In a specific embodiment, an isolation module 14 is also provided between the detection module 13 and the housing 11. The isolation module 14 is used for signal connection and safety isolation between the detection module 13 and the housing 11, thereby protecting the housing 11. Specifically, the isolation module 14 is, for example, an isolation capacitor that meets regulatory requirements at levels Y1 or Y2 and has obtained a safety certification certificate.

[0055] Therefore, according to the embodiment of this utility model, the power supply to the household appliance 10 is provided through the power supply line 12. The detection module 13, the housing 11, and the power supply line 12 form a detection circuit. When the housing 11 becomes energized due to a short circuit with the power supply line 12, the detection module 13 can output an electrical signal. When the controller 71 receives the electrical signal, it generates an alarm signal for the housing being energized and / or controls the household appliance 10 to disconnect from the power supply. Thus, when the housing 11 is energized, the power supply is automatically cut off, and / or a timely reminder message is issued to avoid the risk of electric shock when the user touches it, thereby ensuring the safety of the household appliance 10 and personnel. At the same time, an isolation module 14 is also provided between the detection module 13 and the housing 11. The isolation module 14 is used for signal connection and safety isolation between the detection module 13 and the housing 11, thereby protecting the housing 11 and further ensuring the safety of the household appliance 10 and personnel.

[0056] In a specific embodiment, controller 71 refers to a device that can generate operation control signals based on instruction opcodes and timing signals to instruct electrical equipment 10 to execute control commands. For example, in response to a power-on or power-off command received from a user, controller 71 can perform an operation related to the object selected by the power-on or power-off command.

[0057] This utility model embodiment also provides a hardware structure diagram of the controller, such as... Figure 2 As shown, the controller 71 includes a processor 83, and optionally, a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, memory 82, and communication interface 84 are connected via a bus 81.

[0058] Processor 83 can be a central processing unit (CPU), a general-purpose processor (NP), a network processor (NP), a digital signal processor (DSP), a microprocessor (MCU), a microcontroller (718), a programmable logic device (PLD), or any combination thereof. Processor 83 can also be any other device with processing capabilities, such as a circuit, device, or software module. Processor 83 can also include multiple CPUs, and processor 83 can be a single-core (single-CPU) processor 83 or a multi-core (multi-CPU) processor 83. Here, processor 83 can refer to one or more devices, circuits, or processing cores used for processing data (e.g., computer program instructions).

[0059] The memory 82 can be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, a random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer. This embodiment of the invention does not impose any limitations on this. The memory 82 can exist independently or be integrated with the processor 83. The memory 82 may contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby implementing the control method for the electrical equipment provided in this embodiment of the invention.

[0060] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface 84 can be a module, circuit, transceiver, or any device capable of communication.

[0061] Bus 81 can be a Peripheral Component Interconnect (PCI) bus 81 or an Extended Industry Standard Architecture (EISA) bus 81, etc. Bus 81 can be divided into address bus 81, data bus 81, control bus 81, etc. For ease of representation, Figure 6 The bus is represented by only one thick line, but this does not mean that there is only one bus 81 or one type of bus 81.

[0062] In one embodiment of the present invention, the detection module 13 includes an isolation unit 131, a rectifier unit 132, and a signal conversion unit 133; wherein, one end of the isolation unit 131 is connected to the power supply line 12, and the other end of the isolation unit 131 is connected to the housing 11 through one of the rectifier unit 132 or the signal conversion unit 133, and the rectifier unit 132 and the signal conversion unit 133 are connected.

[0063] In a specific embodiment, one end of the isolation unit 131 is connected to the power supply line 12, and the other end of the isolation unit 131 is connected to the housing 11 via either the rectifier unit 132 or the signal conversion unit 133. The rectifier unit 132 and the signal conversion unit 133 are connected. The isolation unit 131 is used for signal connection and safety isolation with the power supply line 12, and can play a current limiting role, improving the circuit's surge resistance. The rectifier unit 132 is used to convert AC signals into unidirectional DC signals, and the signal conversion unit 133 is used for signal conversion. Specifically, the isolation unit 131 is, for example, an isolation capacitor or an isolation resistor; the rectifier unit 132 is, for example, a full-wave rectifier circuit composed of diode groups or an operational amplifier with rectification function; and the signal conversion unit 133 is, for example, an optocoupler or a transformer.

[0064] Specifically, according to the embodiment of the present invention, the household appliance 10 uses an isolation unit 131 to connect and safely isolate the signal from the power supply line 12, uses a rectifier unit 132 to convert the AC signal into a unidirectional DC signal, and uses a signal conversion unit 133 to perform signal conversion, thereby ensuring that the detection module 13 can detect the energization of the casing 11.

[0065] Figure 3 This is a schematic diagram of a detection module according to an embodiment of the present invention. Figure 4 This is a schematic diagram of a detection module according to an additional embodiment of the present invention. Figure 3 and Figure 4 As shown, in one embodiment of the present invention, the rectifier unit 132 includes a diode group, and the signal conversion unit 133 includes an optocoupler; wherein, the diode group includes multiple diodes connected in parallel, the input terminal of the diode group is connected to the isolation unit 131 and the housing 11 respectively, the output terminal of the diode group is connected to the input terminal of the optocoupler, and the output terminal of the optocoupler is used to output an electrical signal.

[0066] In a specific embodiment, the isolation unit 131 is an isolation resistor or an isolation capacitor, the rectifier unit 132 is a diode group forming a full-wave rectifier circuit, and the signal conversion unit 133 is an optocoupler. One end of the isolation resistor or isolation capacitor is connected to the power supply line 12, and the other end of the isolation resistor or isolation capacitor is connected to the housing 11 through the diode group. The diode group and the optocoupler are connected. The isolation resistor or isolation capacitor serves as a detection branch for signal connection and safety isolation with the power supply line 12. The diode group is used to convert AC signals into unidirectional DC signals, and the optocoupler is used for signal conversion, so that current signals can be transmitted through the optocoupler during both the positive and negative half-cycles of the mains power.

[0067] Specifically, according to the embodiment of the present invention, the household appliance 10 uses an isolation unit 131 to connect and safely isolate the power supply line 12, uses a diode group to convert the AC signal into a unidirectional DC signal, and uses an optocoupler to convert the signal, thereby ensuring that the detection module 13 can detect the energization of the housing 11.

[0068] Figure 5 This is a schematic diagram of a detection module according to another embodiment of the present invention. Figure 6 This is a schematic diagram of a detection module according to another additional embodiment of the present invention. Figure 5 and Figure 6 As shown, in one embodiment of this utility model, the rectifier unit 132 includes a diode group or an operational amplifier with rectification function, and the signal conversion unit 133 includes a transformer; wherein, the diode group includes multiple diodes connected in parallel, the primary coil of the transformer is connected to the isolation unit 131 and the housing 11 respectively, the secondary coil of the transformer is connected to the input terminal of the diode group, and the output terminal of the diode group is used to output an electrical signal, or, the secondary coil of the transformer is connected to the input terminal of the operational amplifier, and the output terminal of the operational amplifier is used to output an electrical signal.

[0069] In a specific embodiment, the isolation unit 131 is an isolation resistor, the rectifier unit 132 is a diode group or an operational amplifier with rectification function, the diode group constitutes a full-wave rectifier circuit, the signal conversion unit 133 is a transformer, one end of the isolation resistor is connected to the power supply line 12, the other end of the isolation resistor is connected to the housing 11 through the primary coil of the transformer, the secondary coil of the transformer is connected to the input terminal of the diode group, and the output terminal of the diode group is used to output an electrical signal, or the secondary coil of the transformer is connected to the input terminal of the operational amplifier, and the output terminal of the operational amplifier is used to output an electrical signal, the isolation resistor serves as a detection branch for signal connection and safety isolation with the power supply line 12, the diode group or the operational amplifier with rectification function is used to convert the AC signal into a unidirectional DC signal, and the transformer is used for signal conversion.

[0070] Specifically, according to the embodiment of the present invention, the household appliance 10 uses an isolation unit 131 to connect and safely isolate the signal from the power supply line 12, uses a diode group or an operational amplifier with rectification function to convert the AC signal into a unidirectional DC signal, and uses a transformer to perform signal conversion, thereby ensuring that the detection module 13 can detect the energization of the housing 11.

[0071] Figure 7 This is a schematic diagram of the structure of a household appliance according to another embodiment of the present invention. Figure 8 This is a structural schematic diagram of a household appliance according to another additional embodiment of the present invention. (See attached diagram.) Figure 7 and Figure 8 As shown, in one embodiment of the present invention, the household appliance 10 further includes a switch module 15, which is disposed between the housing 11 and the detection module 13, or between the housing 11 and the detection module 13; wherein, the controller 71 is configured to: control the switch module 15 to close when a live detection command signal is received; or control the switch module 15 to open when no live detection command signal is received.

[0072] In a specific embodiment, the switch module 15 can be located between the housing 11 and the detection module 13, or between the housing 11 and the detection module 13. The switch module 15 is used to control the switching of the detection module 13.

[0073] In a specific embodiment, when the controller 71 receives a live detection command signal, the control switch module 15 closes, thereby connecting the detection module 13 to the housing 11 and the power supply line 12. The detection module 13 then begins to detect the liveness of the housing 11, thus enabling active control of the live detection function. Specifically, the live detection command signal can be issued by the operator via a remote control device or button, etc.

[0074] In a specific embodiment, when the controller 71 does not receive a live detection command signal, the control switch module 15 is disconnected, thereby disconnecting the detection module 13 from the housing 11 or the power supply line 12. The detection module 13 no longer detects the liveness of the housing 11, thus preventing the detection module 13 from generating additional leakage current to the housing 11, which could lead to abnormal leakage current during normal operation of the household appliance 10. Specifically, the live detection command signal can be issued by the operator via a remote control device or button, etc.

[0075] Specifically, according to the household appliance 10 of this utility model embodiment, the switch module 15 can be located between the housing 11 and the detection module 13, or between the housing 11 and the detection module 13. The switch module 15 is used to control the switching of the detection module 13. When the controller 71 receives a live detection command signal, it controls the switch module 15 to close, thereby actively controlling the activation of the live detection function. When the controller 71 does not receive a live detection command signal, it controls the switch module 15 to open, thereby preventing the detection module 13 from generating additional leakage current to the housing 11, which would cause abnormal leakage current when the household appliance 10 is working normally.

[0076] In one embodiment of the present invention, the switch module 15 includes one or more of a relay, a vacuum tube, a thyristor, and other electronic switches.

[0077] In a specific embodiment, a relay is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) reaches a specified requirement. It has an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). It is commonly used in automated control circuits, and is essentially an "automatic switch" that uses a small current to control a large current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in the circuit.

[0078] In a specific embodiment, the vacuum tube can control the on / off state of the current. By applying an appropriate voltage signal, the cathode current of the vacuum tube can be controlled, thereby controlling the on / off state of the current. Elements such as transient suppression diodes, Zener diodes, and varistors are used in combination to achieve optimized circuit protection.

[0079] In a specific embodiment, a thyristor is a high-power semiconductor device with a four-layer structure and three electrodes. Its structure includes four PN / PN semiconductor layers forming three PN junctions: J1, J2, and J3. When a forward voltage is applied between the A and K terminals, PN junctions J1 and J3 are forward-biased and conduct, while J2 is reverse-biased and cut off, and the thyristor does not conduct. To turn on the thyristor, a forward voltage needs to be applied between the G and K terminals to generate a sufficient gate current Ig flowing into transistor V2. This current is amplified to form a collector current Ic1, ultimately turning on the thyristor. The advantages of thyristors as switching devices include: high voltage and high current handling capability: thyristors are suitable for high-voltage, high-current switching control applications; fast switching speed: thyristors have a fast switching speed, completing turn-on and turn-off operations in microseconds, making them suitable for circuits requiring rapid response; low loss: In the on state, the voltage drop of the thyristor is low, resulting in low losses and improved circuit efficiency.

[0080] Specifically, according to the embodiment of the present invention, the household appliance 10 includes a switch module 15 comprising one or more of a relay, an electron tube, a thyristor, and other electronic switches. The switch module 15 can control the switching of the detection module 13 according to the instructions of the controller 71.

[0081] In one embodiment of the present invention, the switch module 15 includes a single-channel switch, one end of which is connected to the detection module 13, and the other end of which is connected to the neutral wire of the power supply line 12.

[0082] In a specific embodiment, such as Figure 7 or Figure 8 As shown, the switch module 15 is a single-circuit switch. The two ends of the single-circuit switch are connected to the detection module 13 and the neutral wire of the power supply line 12, respectively. When the single-circuit switch is turned on, the neutral wire N, the detection module 13, the housing 11 and the live wire L form a detection circuit. The detection module 13 can determine whether the housing 11 is energized based on the detection circuit.

[0083] Specifically, according to the embodiment of the present invention, the household appliance 10 has a switch module 15 including a single-circuit switch. One end of the single-circuit switch is connected to the detection module 13, and the other end of the single-circuit switch is connected to the neutral wire of the power supply line 12, so that the detection module 13 can determine whether the casing 11 is energized.

[0084] Figure 9 This is a structural schematic diagram of a household appliance according to another additional embodiment of the present invention. For example... Figure 9 As shown, in one embodiment of the present invention, the switch module 15 includes a dual-channel switch. One end of the dual-channel switch is connected to the detection module 13, the first channel of the other end of the dual-channel switch is connected to the neutral wire of the power supply line 12, and the second channel of the other end of the dual-channel switch is connected to the live wire of the power supply line 12.

[0085] In a specific embodiment, such as Figure 7 or Figure 8 As shown, the switch module 15 is a dual-channel switch. One end of the dual-channel switch is connected to the detection module 13, and the first path of the other end of the dual-channel switch is connected to the neutral wire of the power supply line 12, while the second path of the other end of the dual-channel switch is connected to the live wire of the power supply line 12. When the dual-channel switch is connected to the neutral wire N, the neutral wire N, the detection module 13, the housing 11, and the live wire L form a detection circuit. The detection module 13 can determine whether the live wire L is short-circuited with the housing 11 based on the detection circuit. When the dual-channel switch is connected to the live wire L, the live wire L, the detection module 13, the housing 11, and the neutral wire N form a detection circuit. The detection module 13 can determine whether the neutral wire N is short-circuited with the housing 11 based on the detection circuit. In this way, the detection module 13 can not only determine whether the housing 11 is energized based on the detection circuit, but also locate the short-circuited wires, facilitating corresponding repairs or replacements.

[0086] In a specific embodiment, the dual-circuit switch and both the neutral wire N and the live wire L can be fully connected, increasing the short-circuit detection function for the neutral wire N. This ensures correct detection even if the neutral and live wires are incorrectly connected, guaranteeing the detection of a true short circuit between the live wire L and the housing 11. Specifically, in situations where the neutral wire N and the live wire L of the power supply line are reversed in a user's environment, the neutral wire N is connected to the housing 11, thus connecting the housing 11 to the mains power. This forms a circuit branch consisting of the neutral wire N, the dual-circuit switch, the detection module 13, the housing 11, and the neutral wire N. The aforementioned solution of connecting the neutral wire N to a single-circuit switch cannot effectively detect this. However, by using a dual-circuit switch to detect the neutral wire N and the live wire L separately, this type of anomaly can be effectively detected.

[0087] Specifically, according to the embodiment of the present invention, the household appliance 10 has a switch module 15 including a dual-circuit switch. One end of the dual-circuit switch is connected to the detection module 13, the first circuit of the other end of the dual-circuit switch is connected to the neutral wire of the power supply line 12, and the second circuit of the other end of the dual-circuit switch is connected to the live wire of the power supply line 12. This allows the detection module 13 to not only determine whether the housing 11 is energized based on the detection circuit, but also to locate the wire with a short circuit, facilitating corresponding repairs or replacements.

[0088] Figure 10 This is a structural schematic diagram of a household appliance according to another embodiment of the present invention. For example... Figure 10 As shown, the household appliance 10 also includes a surge protection module 16, which is connected to the input terminal of the detection module 13. The surge protection module 16 is used to limit the voltage value flowing into the detection module 13.

[0089] In a specific embodiment, since the interference signals on the power supply side are abundant and powerful, including strong interference signals such as lightning strikes and magnetic storms, to prevent these interferences from affecting the detection circuit, the household appliance 10 also includes a surge protection module 16 connected to the input terminal of the detection module 13. The surge protection module 16 is used to limit the voltage value flowing into the detection module 13, significantly absorb and suppress surge signals, reduce or even eliminate the damaging effects of surge signals, ensure the safe operation of the circuit, and thus protect the detection module 13 from damage, thereby ensuring the normal operation of the detection function. Specifically, the surge protection module 16 includes, for example, voltage-sensitive devices such as varistors, gas discharge tubes, TVS (Transient Voltage Suppressor) tubes, and organic material varistor devices.

[0090] Specifically, according to the embodiment of the present invention, the household appliance 10 has a surge protection module 16 connected to the input terminal of the detection module 13. The surge protection module 16 limits the voltage flowing into the detection module 13 and suppresses the surge current generated at the moment the power is turned on, thereby protecting the detection module 13 from damage and ensuring the normal operation of the detection function.

[0091] In one embodiment of the present invention, the surge protection module 16 includes one or more of a varistor, a gas discharge tube, a transient voltage suppression tube, and an organic varistor.

[0092] In a specific embodiment, a varistor is a resistive device with nonlinear current-voltage characteristics, made of semiconductor material. When the voltage applied across the varistor is below its threshold value, the current flowing through it is extremely small, equivalent to a resistor with infinite resistance; when the voltage exceeds the threshold value, the current flowing through it surges, and the resistance decreases, equivalent to a closed switch. The main functions of a varistor include overvoltage protection, overcurrent protection, lightning strike protection, electromagnetic interference suppression, and temperature sensing.

[0093] In specific embodiments, a gas discharge tube refers to a surge arrester or antenna switch tube used for overvoltage protection. It contains two or more electrodes and is filled with a certain amount of inert gas. The gas discharge tube is a gap-type surge protection element used in communication systems. Its main function is to provide overvoltage and overcurrent protection to prevent damage to electronic equipment. When the overvoltage exceeds the tube's breakdown voltage, the gas inside ionizes under the influence of an electric field, forming a conductor and immediately discharging a large amount of current and charge to ground, protecting equipment and personnel. Furthermore, gas discharge tubes have strong current-carrying capacity, low capacitance, and high insulation resistance. They are often used in the first or first two stages of multi-stage protection circuits, in combination with other protection components such as transient suppression diodes, Zener diodes, and varistors to achieve optimal circuit protection.

[0094] In a specific embodiment, a transient voltage suppressor (TVS diode) is an overvoltage protection device with bidirectional voltage regulation and bidirectional negative resistance characteristics, similar to a varistor. It is used in various AC and DC power supply circuits to suppress transient overvoltages. It operates based on the avalanche breakdown characteristics of semiconductor materials. When the voltage in the circuit exceeds its set threshold, the TVS diode quickly transitions from a high-resistance state to a low-resistance state, rapidly dissipating the overvoltage to ground, thereby protecting the circuit from damage. When the overvoltage disappears, the TVS diode automatically returns to the high-resistance state and continues to monitor the circuit.

[0095] In a specific embodiment, the organic varistor is an electronic component made using varistor properties. When an overvoltage occurs in the circuit, the resistance of the organic varistor drops rapidly, thereby discharging the overvoltage to ground and protecting other components in the circuit from damage.

[0096] Specifically, according to the household appliance 10 of this utility model embodiment, the surge protection module 16 includes one or more of a varistor, a gas discharge tube, a transient voltage suppression tube, and an organic material varistor. The surge protection module 16 can limit the voltage value flowing into the detection module 13 and suppress the surge current generated at the moment the power is turned on, thereby protecting the detection module 13 from damage and ensuring the normal operation of the detection function.

[0097] Figure 11 This is a schematic diagram of the structure of a household appliance according to a specific embodiment of the present invention. Figure 12 This is a structural schematic diagram of a household appliance according to another specific embodiment of the present utility model, which is described below in conjunction with... Figure 11 and Figure 12 The specific embodiments shown illustrate the household appliance 10 of the above embodiments of this utility model:

[0098] like Figure 11 As shown in this specific embodiment, the household appliance 10 transmits the voltage signal from the primary side to the secondary side through a transformer. If the casing 11 is short-circuited with the live wire L or the neutral wire N, there is voltage on the primary side of the transformer. If the casing 11 is not short-circuited with the live wire L or the neutral wire N, there is no voltage on the primary side of the transformer.

[0099] like Figure 11 As shown, in this specific embodiment, the household appliance 10 connects the switch module 15 to the neutral wire N. In this connection state, based on the neutral wire N, a short circuit between the live wire L and the housing 11 can be detected. This forms a circuit branch consisting of the neutral wire N, the switch module 15, the detection module 13, the housing 11, and the live wire L. When the housing 11 becomes energized due to a short circuit between it and the live wire L, the detection module 13 can detect the short circuit between the housing 11 and the power grid.

[0100] like Figure 12 As shown, in this specific embodiment, the household appliance 10 connects the switch module 15 to the live wire L. In this connection state, based on the live wire L, a short circuit between the neutral wire N and the housing 11 can be detected. This forms a circuit branch consisting of the live wire L, switch module 15, detection module 13, housing 11, and neutral wire N. When the housing 11 and neutral wire N are short-circuited and energized, the detection module 13 can detect the short circuit between the housing 11 and the power grid.

[0101] In this specific embodiment, when the housing 11 is short-circuited, i.e., short-circuited with the live wire L, the switch module 15 closes, forming a path from the neutral wire N, switch module 15, converter, safety capacitor Cy, and point Vb of the housing 11, through the housing 11 to the short-circuit point Va, and finally to the live wire L. During the closed-loop operation of the switch module 15, the mains signal between N and L forms a signal path through the housing 11. The converter detects the current in this branch, and after rectification by the full-wave rectifier circuit, an alarm signal Vs is obtained, which is further transmitted to the controller for processing.

[0102] In this specific embodiment, the safety protection detection and control method of the switch module 15 is as follows:

[0103] The switch module 15 on the neutral wire N side is turned on at a preset time point: the neutral wire N, switch module 15, detection module 13, safety capacitor Cy, housing 11 and live wire L form a detection circuit, which applies a short-term power supply to detect whether current flows through it, and then determines whether there is a short circuit between housing 11 and live wire L:

[0104] If current is detected flowing through the aforementioned detection circuit, it can be determined that there is a short circuit between the housing 11 and the live wire L. That is, the housing 11 and the live wire L are short-circuited, and the housing 11 will be in a dangerous state of being electrified after the appliance is powered on. The alarm signal of the detected current is transmitted to the controller.

[0105] If no current is detected flowing through the aforementioned circuit, it can be determined that there is no short circuit between the housing 11 and the live wire L, that is, the housing 11 and the live wire L are disconnected, and the housing 11 will not pose a risk of being electrified due to the live wire L.

[0106] Switch module 15 switches from the normally open position to the neutral line N closed position. A simplified diagram of its working principle is shown below. Figure 12 As shown, when the switch module 15 switches from the neutral wire N position to the live wire L position, it can detect a short circuit between the neutral wire N and the housing 11.

[0107] If current is detected flowing through the aforementioned circuit, it can be determined that there is a short circuit between the casing 11 and the neutral wire N. That is, after the appliance is powered on, the casing 11 will be in a dangerous state of being electrified: the neutral wire N and the casing 11 are short-circuited, and the casing 11 becomes an unsafe object. An alarm signal indicating the detected current is transmitted to the controller.

[0108] If no current is detected flowing through the aforementioned circuit, it can be determined that there is no short circuit between the housing 11 and the neutral line N, that is, the housing 11 and the neutral line N are disconnected, and the housing 11 will not be at risk of being electrified due to the neutral line N.

[0109] When a short circuit is detected in the housing 11, the controller issues an alarm signal and can also disconnect the power supply to the household appliance 10 through the processing unit.

[0110] In this specific embodiment, to avoid false alarms caused by interference from short-term lightning strikes or voltage surges, the test continues after a preset interval. Only after n tests are all determined to have a short circuit is the live alarm information confirmed.

[0111] In this specific embodiment, after the detection is completed, the switch module 15 is disconnected, and the household appliance 10 enters the normal working state, so as to avoid the detection circuit constructed by the device generating additional leakage current to the housing 11, which would cause abnormal leakage current when the household appliance 10 is working normally.

[0112] In summary, according to the embodiment of this utility model, the household appliance 10 is powered by a power supply line 12. The detection module 13, the housing 11, and the power supply line 12 form a detection circuit. When the housing 11 becomes energized due to a short circuit with the power supply line 12, the detection module 13 can output an electrical signal. When the controller 71 receives the electrical signal, it generates an alarm signal for the housing being energized and / or controls the household appliance 10 to disconnect from the power supply. Thus, when the housing 11 is energized, the power supply is automatically cut off, and / or a timely reminder is issued to avoid the risk of electric shock when the user touches it, thereby ensuring the safety of the household appliance 10 and personnel. At the same time, an isolation module 14 is also provided between the detection module 13 and the housing 11. The isolation module 14 is used for signal connection and safety isolation between the detection module 13 and the housing 11, thereby protecting the housing 11 and further ensuring the safety of the household appliance 10 and personnel.

[0113] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0114] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A household appliance, characterized in that, include: case; A power supply line, which is connected to a power source; A detection module is provided, with one end connected to the housing and the other end connected to the power supply line. The detection module, the housing, and the power supply line form a detection loop. The detection module is used to detect whether the housing is energized based on the detection loop and outputs a corresponding electrical signal when the housing is detected to be energized. An isolation module is disposed between the detection module and the housing, and the isolation module is used for signal connection and safety isolation between the detection module and the housing; The controller is configured to: When the electrical signal is received, an alarm signal for the casing being energized is generated and / or the power to the household appliance is cut off.

2. The household appliance according to claim 1, characterized in that, The detection module includes an isolation unit, a rectification unit, and a signal conversion unit; One end of the isolation unit is connected to the power supply line, and the other end of the isolation unit is connected to the housing via either the rectifier unit or the signal conversion unit. The rectifier unit and the signal conversion unit are connected.

3. The household appliance according to claim 2, characterized in that, The rectifier unit includes a diode array, and the signal conversion unit includes an optocoupler. The diode group includes multiple diodes connected in parallel. The input terminals of the diode group are connected to the isolation unit and the housing, respectively. The output terminal of the diode group is connected to the input terminal of the optocoupler. The output terminal of the optocoupler is used to output the electrical signal.

4. The household appliance according to claim 2, characterized in that, The rectifier unit includes a diode array or an operational amplifier with rectification function, and the signal conversion unit includes a transformer. The diode group includes multiple diodes connected in parallel. The primary coil of the transformer is connected to the isolation unit and the housing, respectively. The secondary coil of the transformer is connected to the input terminal of the diode group. The output terminal of the diode group is used to output the electrical signal. Alternatively, the secondary coil of the transformer is connected to the input terminal of the operational amplifier. The output terminal of the operational amplifier is used to output the electrical signal.

5. The household appliance according to claim 1, characterized in that, Also includes: A switch module, wherein the switch module is disposed between the housing and the detection module, or between the housing and the detection module; wherein, The controller is configured to: When a live detection command signal is received, the switch module is controlled to close; or, When no live detection command signal is received, the switch module is controlled to disconnect.

6. The household appliance according to claim 5, characterized in that, The switching module includes one or more of relays, electron tubes, thyristors, and other electronic switches.

7. The household appliance according to claim 5, characterized in that, The switch module includes a single-circuit switch, one end of which is connected to the detection module, and the other end of which is connected to the neutral wire of the power supply line.

8. The household appliance according to claim 5, characterized in that, The switch module includes a dual-channel switch. One end of the dual-channel switch is connected to the detection module, the first channel of the other end of the dual-channel switch is connected to the neutral wire of the power supply line, and the second channel of the other end of the dual-channel switch is connected to the live wire of the power supply line.

9. The household appliance according to claim 1, characterized in that, Also includes: A surge protection module is provided, which is connected to the input terminal of the detection module, and is used to limit the voltage value flowing into the detection module.

10. The household appliance according to claim 9, characterized in that, The surge protection module includes one or more of a varistor, a gas discharge tube, a transient voltage suppression tube, and an organic varistor.

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