Leakage protection device

Abstract

The utility model provides a leakage protection device which comprises a shell and a movement assembly arranged in the shell, the movement assembly comprises an input end assembly, an output end assembly, an execution assembly and a control circuit board, and the input end assembly comprises at least one pair of plug pieces extending out of the shell. The machine core assembly further comprises a temperature detection piece which is coupled to the control circuit board and arranged adjacent to the plug piece so as to detect the temperature of the plug piece. The state indicating piece is coupled to the control circuit board and responds to the detection temperature of the temperature detection piece to provide indication, the execution assembly is configured to enable the input end assembly and the output end assembly to be in a disconnected state based on the fact that the detection temperature of the temperature detection piece is larger than a preset temperature, and the state indicating piece provides fault indication. The control circuit board is configured to prevent the input end assembly and the output end assembly from being connected again before the input end power supply is cut off, so that the output end assembly does not output power. According to the leakage protection device, the temperature detection part and the state indication part are integrated in the leakage protection device, so that the dangerous situation caused by overheating of the input end assembly can be effectively detected and avoided, the indication of the working state and the fault state can be provided in time, and the personal safety and property safety of a user are protected.

Description

Technical Field

[0001] The present disclosure generally relates to the electrical field, and more particularly to a leakage protection device with an overheat protection function and capable of realizing multiple state displays. Background Art

[0002] In order to improve the safety of electricity use, the use of leakage protection devices is becoming more and more widespread, and their application areas and scenarios are also continuing to increase. Although the existing leakage protection devices can provide basic leakage protection functions, when a leakage is detected at the load end, the product can quickly trip to cut off the power to the load end and protect the personal safety of the user. However, in actual use, safety issues are still found. For example, local overheating of the leakage protection device causes the product shell to melt and even cause fires. In addition, existing leakage protection devices usually do not have a status indication function, or only provide an indication function to display the normal working status. Users cannot have an intuitive perception of the various faults that occur in the power circuit, which brings inconvenience to use.

[0003] As people's requirements for the reliability and functionality of leakage protection devices continue to increase, the market currently needs a product that can provide overheating protection functions and provide intuitive visual functions for working status and fault status. Utility Model Content

[0004] Based on the above needs, the present disclosure proposes a leakage protection device, which, in addition to the conventional leakage protection function, also has the function of overheating detection and power cut-off to prevent the temperature from continuing to rise, and can provide different status indications based on the working status and fault status, which is convenient for users to use and improves the comfort and safety of the experience.

[0005] To this end, the present disclosure provides a leakage protection device, comprising a shell and a core assembly arranged in the shell, the core assembly comprising an input end assembly, including at least a pair of plug blades extending out of the shell, for coupling an input end power supply; an output end assembly, for coupling a load electrical appliance; an execution assembly, for controlling the connection state between the input end assembly and the output end assembly; a control circuit board, for controlling the movement and state of the execution assembly; a temperature detection member, the temperature detection member being coupled to the control circuit board and arranged adjacent to the plug blades to detect the temperature of the plug blades; and a status indicator, the status indicator being coupled to the control circuit board and responding to the temperature detection. The detection temperature of the measuring piece is detected and an indication is provided, wherein the execution component is configured to make the input end component and the output end component in a disconnected state based on the detection temperature of the temperature detecting piece being greater than a preset temperature, and the status indicator provides a fault indication, and the control circuit board is configured to prevent the input end component and the output end component from being connected again before the input end power is disconnected, so that the output end component has no power output, that is, it is necessary to disconnect the input end power of the input end component or unplug the plug from the power socket, and then connect the input end power again or insert the plug into the power socket, and the input end component and the output end component can be connected again.

[0006] According to the above technical concept, the present disclosure may further include any one or more of the following optional forms.

[0007] In some optional forms, the movement assembly includes a reset assembly, which is configured to connect the input end assembly and the output end assembly again when the input end assembly and the output end assembly are in a disconnected state.

[0008] In some optional forms, the status indicator indicates at least one of a power-on state, a power-off state, a leakage state, an overheating state, and a self-test fault state in response to the state of the movement assembly.

[0009] In some optional forms, the status indicator includes an indicator light, which is in an off state, a lit state of a different color, or a flashing state of a different color in response to the state of the movement assembly.

[0010] In certain optional forms, the indicator light is configured to be lit or flashed in a first color in response to the core component being in an overheating state; or the indicator light is configured to be lit in a second color in response to the core component being in a power-on state, or the indicator light is configured to be off or flashed in a second color in response to the core component being in a leakage state, or the indicator light is configured to be lit or flashed in a third color in response to the core component being in a self-test fault state.

[0011] In some optional forms, at least one status indication window is provided on the housing so as to directly observe one or more states of the movement assembly from outside the housing.

[0012] In some optional forms, the status indication window is provided with a light guide.

[0013] In some optional forms, the input end component or the output end component is configured to include an elastic member, and the elastic member cooperates with the execution component to separate or contact the input end component and the output end component to be in a disconnected state or a connected state.

[0014] In some optional forms, the actuator includes a coil assembly coupled to the control circuit board, a magnetic frame assembly, a reset plate and an iron core, the coil assembly being placed in the magnetic frame assembly and capable of generating a magnetic field when powered on and removing the magnetic field when powered off, wherein the iron core passes through the coil assembly and is configured to move in response to the powered on state or the powered off state of the coil assembly.

[0015] In some optional forms, the reset plate is attached to the iron core so that when the coil assembly is energized, the iron core moves from an initial position to drive the reset plate so that the input end assembly and the output end assembly are in contact to be in a connected state, and when the coil assembly is de-energized, the elastic member separates the input end assembly from the output end assembly to be in a disconnected state and drives the reset plate and the iron core to move to the initial position.

[0016] In some optional forms, the reset plate has a first end attached to the iron core and a second end adapted to abut the elastic member, and the reset plate is configured to cause the first end and the second end to pivot around a pivot axis under the action of the iron core or the elastic member.

[0017] In some optional forms, the reset assembly includes a reset switch coupled to the control circuit board and a reset button attached to the reset switch, and the reset button is exposed outside the housing.

[0018] In some optional forms, the movement assembly includes a test assembly, which includes a test switch coupled to the control circuit board and a test button attached to the test switch, and the test button is exposed outside the housing.

[0019] In some optional forms, the shell includes an upper shell and a lower shell attached to each other, the lower shell includes a first lower shell and a second lower shell attached to each other, and the leakage protection device includes at least a seal arranged between the upper shell and the lower shell and / or between the first lower shell and the second lower shell.

[0020] By integrating a temperature detector into the leakage protection device, the present disclosure can effectively detect and avoid dangerous situations caused by overheating of the input terminal components, thereby protecting the personal safety of users and their property safety. The present disclosure also integrates a status indicator, while providing reliability for the leakage protection device. By utilizing a reasonable structural design and layout, the present disclosure realizes the functions of displaying the working status and fault status in a relatively small space, and can provide instructions or warnings to the user based on the working status and fault status, thereby improving safety of use. The leakage protection device disclosed in the present disclosure has a simple structure, low cost, is easy to implement, and has reliable performance. It is suitable for automated production and can be applied in various occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features and advantages of the present disclosure will be better understood through the following detailed description of the optional embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 Schematic diagram of the appearance of a leakage protection device according to one embodiment of the present disclosure;

[0023] Figure 2 for Figure 1 Schematic diagram of the leakage protection device at another viewing angle;

[0024] Figure 3 for Figure 1 A schematic diagram of the leakage protection device at another viewing angle;

[0025] Figure 4 for Figure 1 Exploded diagram of the leakage protection device;

[0026] Figure 5 for Figure 1 Schematic diagram of the housing of the leakage protection device;

[0027] Figure 6 is a schematic diagram of the housing from another perspective;

[0028] Figure 7 Schematic diagram of the shell;

[0029] Figure 8 for Figure 1 Schematic diagram of the connection principle of the components of the leakage protection device;

[0030] Figure 9 for Figure 4 A schematic diagram of one embodiment of the middle movement assembly;

[0031] Figure 10 for Figure 9 Schematic diagram of the central movement assembly from another perspective;

[0032] Figure 11 for Figure 10 Exploded diagram of the middle movement assembly;

[0033] Figure 12 A cross-sectional diagram showing the input and output components of a leakage protection device in a disconnected state;

[0034] Figure 13 A cross-sectional diagram showing a state in which the input-end component and the output-end component of the leakage protection device are in a connected state;

[0035] Figure 14 4 is a circuit diagram of a leakage protection device according to one embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] The following describes the implementation and use of the embodiments in detail. However, it should be understood that the specific embodiments discussed are merely illustrative of specific ways to implement and use the present disclosure and are not intended to limit the scope of the present disclosure. When describing the structural positions of various components, such as up, down, top, and bottom, directional expressions are not absolute but relative. These directional expressions are appropriate when the components are arranged as shown in the figures, but if the positions of the components in the figures are changed, these directional expressions will also change accordingly.

[0037] Herein, the expression “include” or similar expressions “including” and “having” are open-ended and do not exclude additional unlisted elements or functions.

[0038] As used herein, the terms "coupling," "attachment," and "connection" should be understood broadly. For example, "connection" can refer to a fixed connection, a detachable connection, or an integral connection; and "coupling" or "attachment" can refer to a direct connection or an indirect connection via an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this document based on specific circumstances.

[0039] Herein, the terms "first", "second", etc. are not used to limit the order or quantity unless otherwise specified.

[0040] The core unit in existing leakage protection devices typically integrates most of the components required to provide basic leakage protection, including but not limited to tripping and resetting functions. When a leakage condition is detected at the load end, the device quickly trips, disconnecting the load and protecting the user. In actual use, the inventors have discovered that localized overheating of leakage protection devices can cause the product housing to melt and even cause fires. For example, in leakage protection plugs, where the plug blades connect to the socket, the reduced elasticity of the socket blades can increase the localized contact resistance. This can cause localized overheating of the plug blades, ultimately melting the plug housing and even causing fires. Furthermore, the inventors have discovered that existing leakage protection devices typically lack status indicators or only provide indicators that indicate normal operating status. This prevents users from intuitively understanding various faults in the power lines, causing inconvenience and increasing the risks of electricity use.

[0041] Based on this, the present disclosure provides a leakage protection device, which can effectively detect the overheating state of the input end component and quickly cut off the power supply after detecting the overheating state, thereby avoiding dangerous situations caused by overheating of the input end component. In addition to avoiding leakage safety accidents, it can further avoid the occurrence of electrical fires and protect the personal safety of users and their property safety.

[0042] Specifically, Figure 1 A leakage protection device in the form of a leakage protection plug is exemplified. It should be understood that the leakage protection device is described below using the leakage protection plug as an example. The leakage protection device applicable to the present disclosure includes but is not limited to the leakage protection plug.

[0043] Combine Figures 1 to 4 , the leakage protection device conceived according to the present disclosure includes a shell 10 and a core assembly 80 arranged in the shell 10, the core assembly 80 includes a control circuit board 81, an input end assembly and an output end assembly coupled to the control circuit board 81, and an execution assembly. Here, the execution assembly refers to a component that is controlled by the control circuit board 81 and can manipulate the connection state (that is, disconnection or connection (closure)) between the input end assembly and the output end assembly. In the illustrated embodiment, the core assembly 80 also includes a reset assembly, which is configured to make the input end assembly and the output end assembly connected again when the input end assembly and the output end assembly are in a disconnected state, and may include a reset switch 31 coupled to the control circuit board 81 and a reset button 30 attached to the reset switch 31, and the reset button 30 may be exposed outside the shell 10. More specifically, in combination with Figures 4 to 7The housing 10 may include an upper housing 11 and a lower housing attached to each other, wherein the lower housing includes a first lower housing 12 and a second lower housing 13 attached to each other. The upper housing 11 is provided with a reset button opening 112 for the reset button 30 to protrude from the upper housing 11.

[0044] Advantageously, the movement assembly 80 includes a test assembly, which includes a test switch 41 coupled to the control circuit board 81 and a test button 40 attached to the test switch 41, wherein the test button 40 can be exposed outside the housing 10. More specifically, the upper housing 11 is provided with a test button opening 113 for the test button 40 to protrude from the upper housing 11.

[0045] The input end assembly includes at least a pair of plug blades 50 extending out of the housing 10, and the output end assembly includes at least an output power line 60 extending out of the housing 10. Accordingly, the housing 10 (specifically the first lower housing 12) may be provided with a plug blade through hole 121 for the plug blade 50 to extend out, such as Figure 5 As shown, the housing 10 may be provided with an output line through hole 114 for the output power line 60 to extend out. Specifically, the upper housing 11 and the second lower housing 13 may be provided with half holes respectively to splice to form the output line through hole 114, as shown in FIG. Figure 7 shown.

[0046] The upper shell 11 and the lower shell (the first lower shell 12 and the second lower shell 13) can be attached by various suitable assembly methods, including but not limited to self-tapping screw assembly, ultrasonic welding, adhesive bonding, etc. Figure 4 As shown in the example, the upper shell 11 and the lower shell can be attached by screws 70. Advantageously, the leakage protection device includes at least a seal provided between the upper shell 11 and the lower shell and / or between the first lower shell 12 and the second lower shell 13, so that the shell has good dustproof and waterproof effects. Figure 4 and Figure 7 In the example shown, the seal can be designed as an integral housing sealing ring 14 .

[0047] According to the present disclosure, the core assembly 80 includes a temperature detection member 82, which is coupled to the control circuit board 81 and arranged adjacent to the input terminal assembly to detect the temperature of the input terminal assembly. Figures 8 to 11 As shown, the temperature detection member 82 is arranged adjacent to the plug blade. The core assembly 80 is configured to disconnect the input end assembly and the output end assembly based on the temperature detected by the temperature detection member 82 being greater than a preset temperature.

[0048] When the leakage protection device is a leakage protection plug, its normal operating temperature range is usually 0℃ to 40℃. Depending on the material of the shell, the heat-resistant temperature of the shell is usually 50℃ to 70℃. Even if the heat-resistant temperature of the shell of certain materials can reach 110℃ or even 150℃, it is necessary to control the temperature of the leakage protection device to, for example, below 70℃ to avoid damage to internal components. Therefore, depending on different needs, the preset temperature can be set to 70℃ to 150℃, such as 70℃, 150℃ and any temperature value within the interval with the above two temperature values ​​as endpoints, such as 75℃, 120℃, etc. Accordingly, once the temperature detection component detects that the temperature of the input end component reaches or exceeds the preset temperature, the movement component can make the input end component and the output end component in a disconnected state, that is, an overheating power-off state.

[0049] The temperature detection member 82 may be a temperature sensor. Advantageously, for a leakage protection plug, the temperature detection member 82 may be arranged on the inner wall of the housing 10 and between a pair of plug blades 50. Figure 10 As shown, or positioned adjacent to each of the pair of plug blades 50, the temperature near the plug blade or the inner wall of the housing is detected, and a temperature signal is transmitted to the control circuit board 81. In this way, by integrating the temperature sensor, the leakage protection device not only provides leakage protection but also rapidly cuts off power when the plug blade temperature or the housing temperature reaches a predetermined value, thereby preventing the plug blade temperature from continuing to rise and potentially causing a dangerous condition. It should be understood that, depending on different needs, one or more temperature sensors may be provided. When a single temperature sensor is used, one or more sensing terminals may also be provided to ensure the accuracy and reliability of the detected temperature values.

[0050] Advantageously, the core assembly 80 is configured to prevent the input terminal assembly and the output terminal assembly from being connected again (i.e., resetting) before the input terminal is disconnected from the input terminal power supply and then reconnected to the input terminal power supply in the event of a power outage due to an overheating fault. In other words, if the leakage protection device is in a disconnected state due to the detection temperature of the temperature detection component being greater than the preset temperature, the input terminal assembly and the output terminal assembly cannot be restored to a connected state through a conventional reset operation. Only after the leakage protection device is powered off and then powered on again, for example, the input terminal power supply is disconnected or the plug is pulled out of the socket to power off the input terminal, and the user checks and confirms the overheating damage and then connects the input terminal power supply again or inserts the plug into the socket again to power on the input terminal, can the leakage protection device return to a normal state. At this time, a reset operation (i.e., the user presses the reset button) to restore the input terminal assembly and the output terminal assembly to a connected state, which further ensures the safety of the leakage protection device.

[0051] According to the present disclosure, the core assembly 80 further includes a status indicator 22, which provides working status and fault status indications to prompt the user of the cause of the fault, especially providing indications in response to the temperature detected by the temperature detection element. Figure 4 As shown, the status indicator 22 is coupled to the control circuit board 81 and can indicate or warn the user in response to the status of the core assembly 80. The housing 10 (specifically the upper housing 11) may be provided with at least one status indicator window 20, such as Figure 1 As shown, the status indication window 20 can be made of a transparent material. Optionally, a status indication hole 111 can also be provided on the housing 10. Figure 7 As shown, the user can directly observe one or more states of the core assembly from the outside of the housing 10. The state of the core assembly 80 includes but is not limited to at least one of the following: power-on state, power-off state, leakage state, overheat state, and self-test fault state. In some embodiments, the status indicator window 20 (or status indicator hole 111) may be provided with a light guide 21, such as Figure 4 shown.

[0052] The status indicator 22 may be optionally an indicator light, such as a controllable three primary colors (RGB) LED or a plurality of color LEDs. The indicator light is in an off state or a lit state of a different color or a flashing state of a different color in response to the state of the core assembly 80. In certain embodiments, according to the different states of the core assembly, the indicator light is configured to be in a lit state or a flashing state of a first color (e.g., yellow) in response to the core assembly being in an overheated state; or the indicator light is configured to be in a lit state of a second color (e.g., green) in response to the core assembly being in a powered state; or the indicator light is configured to be in an off state or a flashing state of a second color in response to the core assembly being in a leakage state; or the indicator light is configured to be in a lit state or a flashing state of a third color (e.g., red) in response to the core assembly being in a self-test fault state.

[0053] The electrical connection between the input terminal component and the output terminal component is achieved, for example, by means of a moving and stationary contact piece. Figure 11As shown, the input end assembly also includes a pair of input static contact pieces 83 (live wire input end and neutral wire input end) with electrostatic contacts. The pair of input static contact pieces 83 are connected to a pair of plug pieces 50 and welded to the control circuit board 81. The output end assembly also includes a pair of output movable contact pieces 84 (live wire output end and neutral wire output end), wherein one end of the output movable contact piece 84 is welded to the control circuit board 81, and the other end is configured to include an elastic member, that is, an elastic movable contact arm 841. The elastic movable contact arm 841 has a movable electrical contact and can cooperate with the actuator assembly to separate or contact the input end assembly and the output end assembly (that is, the electrostatic contact and the movable electrical contact are separated or contacted) to be in a disconnected state or a connected state. The output end assembly also includes an output terminal 843 coupled to the control circuit board 81 and an output connecting piece 842 for connecting to the output power line 60. The pin of the output terminal 843 passes through the center hole of the leakage detection coil 86 and connects to one end of the output connecting piece 842. The other end of the output connecting piece 842 is connected to the pin of the output movable contact piece 84. This allows the leakage detection coil 86 to detect leakage signals from the main circuit and transmit the signals to the control circuit board 81. In certain embodiments, the input terminal assembly may further include a plug piece pressing block 87 and a plug piece waterproof gasket 88 disposed between the plug piece pressing block 87 and the inner wall of the housing.

[0054] In the illustrated embodiment, the movement assembly 80 can be positioned and assembled in the housing 10 via a mounting bracket 852. The actuator assembly 85 includes a coil assembly 853 coupled to the control circuit board 81, a magnetic frame assembly 855, and an iron core 854. The coil assembly 853 is provided with a coil winding and is placed in the magnetic frame assembly 855. The coil assembly 853 is capable of generating a magnetic field when powered on and removing the magnetic field when powered off. The iron core 854 passes through the inner hole of the coil assembly 853 and is configured to move in response to the power-on state or the power-off state of the coil assembly 853. The actuator assembly may include a reset plate 851, which is attached to the iron core 854 so that when the coil assembly 853 is in the energized state, the iron core 854 moves from the initial position to drive the reset plate 851 so that the input end assembly and the output end assembly are in contact and are in a connected state, and when the coil assembly 853 is in the de-energized state, the elastic member (elastic movable contact arm 841) separates the input end assembly from the output end assembly so that they are in a disconnected state and drives the reset plate 851 and the iron core 854 to move to the initial position.

[0055] Specifically, in the illustrated embodiment, reset plate 851 has a first end 8513 attached to iron core 854 and a second end 8511 adapted to abut against a resilient member (elastic movable contact arm 841). Advantageously, reset plate 851 is configured such that, under the action of iron core 854 or the resilient member, first end 8513 and second end 8511 pivot about pivot axis 8512. This compact design enables the closing and opening of the movable and static contacts within a relatively small space, effectively ensuring a relatively stable connection and disconnection between the input and output components.

[0056] The following combination Figure 4 、 Figure 8 、 Figures 11 to 13 The state and operation process of the leakage protection device in certain embodiments of the present disclosure are summarized.

[0057] Figure 12 The leakage protection device shown is in a power-off state, where the power-off state includes but is not limited to a normal power-off state, a leakage power-off state, or an overheating power-off state. At this time, the input end component and the output end component are disconnected, the output end or the output power line 60 has no power, and the status indicator 22 may be in an off state.

[0058] When the leakage protection device is removed from the input power supply (for example, unplugged from the socket) and confirmed to be able to be used normally, such as after the overheating power-off state, the leakage protection device is reconnected to the input power supply (for example, the plug piece 50 is inserted back into the socket) and energized to enable the actuator 85 to start performing the control reset. According to the setting of the control circuit board 81, the control reset method can be selected as automatic reset type and manual reset type. With the automatic reset type, when the plug piece 50 is powered, the control circuit board 81 controls the actuator 85 to act directly so that the input end component and the output end component are in a connected state. With the manual reset type, the control circuit board 81 will only control the actuator 85 to act to connect the input end component and the output end component when it receives the reset signal of the reset switch 31 (that is, manually pressing the reset button 30). At this time, the coil winding of the coil assembly 853 is energized to generate a magnetic field and drive the iron core 854 to move toward the interior of the coil assembly 853. Since the head 8541 of the iron core 854 is attached to the first end 8513 of the reset plate 851 (for example, clamped), when the iron core 854 moves toward the interior of the coil assembly 853, its head 8541 pulls the first end 8513 of the reset plate 851 to move together, so that the first end 8513 rotates around the pivot shaft 8512, thereby driving the reset plate 851 to abut the second end 8511 of the elastic member (elastic movable contact arm 841) to overcome the rebound force of the elastic movable contact arm 841 of the output movable contact piece 84, so that it moves toward the position of the input static contact piece 83 and contacts and closes with the corresponding electrostatic contact thereon, as shown in FIG. Figure 13As shown, the input end component and the output end component are closed and connected, and the product can work normally. At this time, the status indicator 22 can be in a green light state.

[0059] On the contrary, when the power is cut off and the coil winding loses power, the magnetic field disappears, and the output movable contact piece 84 moves to a position away from the input static contact piece 83 under the action of the rebound force of its elastic movable contact arm 841, and the input end component is disconnected from the output end component, while driving the reset plate 851 and the iron core 854 back to the original position. Figure 12 In the initial position shown, the status indicator 22 may be in an extinguished state.

[0060] The leakage protection device is in the normal power-on state. When the test button 40 is pressed, the control circuit board 81 receives the test signal provided by the test switch 41 and provides a simulated leakage signal to the leakage detection coil 86 to test whether the leakage protection function is intact. At this time, the product with intact function will trip directly, that is, the actuator 85 will perform an action to disconnect the input end component and the output end component, and the status indicator 22 will be off. Press the reset button 30 again, the control circuit board 81 receives the reset signal provided by the reset switch 31 and controls the actuator 85 to act so that the input end component and the output end component are connected. The leakage protection device returns to the normal power-on state, the status indicator 22 is green and lit, and the load end LOAD can use electricity normally.

[0061] When the leakage protection device is in the normal power-on state, if a leakage fault occurs at the output end, the leakage detection coil 86 will send the detected leakage signal to the control circuit board 81, and then control the execution component 85 to quickly disconnect the input end component and the output end component to make the output end lose power, and the status indicator 22 will be off or flashing green.

[0062] When the leakage protection device is in the normal power-on state, if a self-test failure occurs, that is, the product detects that the key components of the leakage protection function have failed and the product no longer has the leakage protection function, the control circuit board 81 will control the execution component 85 to disconnect the input end component and the output end component to make the output end lose power. The status indicator 22 will flash red, indicating that the product life has ended, and the user is reminded not to continue using it.

[0063] When the leakage protection device is in the normal power-on state, if a local overheating fault occurs at the input end, the temperature sensor 82, located on the inner wall of the housing 10 and adjacent to the plug blade 50, will transmit the detected temperature value signal to the control circuit board 81. If the control circuit board 81 determines that the temperature value exceeds a preset temperature value, it will control the actuator 85 to quickly disconnect the input and output components, thereby de-energizing the output end and preventing the temperature of the input plug blade 50 from further increasing. At this time, the status indicator 22 will illuminate yellow or flash, serving as a warning. In this state, if the reset button is pressed again, the actuator 85 will not activate, and the status indicator 22 will remain unchanged. The product will only return to its original state by unplugging the product from the socket, checking for overheating damage, and then plugging it back into the socket to re-energize it. After that, pressing the reset button 30 will restore the connection between the input and output components, and the status indicator 22 will illuminate green, indicating that the product is functioning normally.

[0064] Figure 14 This is an example circuit diagram of a leakage protection device according to one embodiment of the present disclosure. In this diagram, leakage detection circuit ZCT1 corresponds to leakage detection coil 86; test switch TEST and reset switch RESET correspond to test switch 41 and reset switch 31, respectively; relay coil RELAY corresponds to coil assembly 853, iron core 854, and magnetic frame assembly 855; and thermistor T1 corresponds to temperature sensor 82. U1 is the signal processing and control chip, i.e., the leakage detection chip; DB1 is a diode bridge. The remaining electrical components and their connections are self-explanatory. The operating principle of this circuit is described below.

[0065] During normal operation, current flows through the path L-C2-DB1-RELAY-U1-GND-DB1-N, causing the relay coil RELAY to generate a relatively large magnetic field, keeping the reset switch RELAY closed, and electrically connecting the input terminal LINE to the output terminal LOAD.

[0066] When leakage detection circuit ZCT1 detects leakage current on current-carrying lines L and N, it generates a leakage signal, which is input to and processed by leakage detection chip U1. When the leakage signal exceeds a preset threshold, pin 1 of leakage detection chip U1 outputs a high voltage level, triggering silicon-controlled rectifier (thyristor) Q1 to turn on. Because of this, most of the current no longer flows through RELAY-U1-GND, but instead flows directly through Q1-GND. As a result, the magnetic field in relay coil RELAY weakens, causing the reset switch RESET to disconnect the electrical connection between the input and output terminals.

[0067] When thermistor T1 detects a relatively high temperature, its resistance decreases, causing the voltage at the reference pin of Zener diode Q4 (i.e., the upper terminal of R11) to increase. When this voltage exceeds Q4's regulation or adjustment voltage (e.g., 2.5V), Zener diode Q4 conducts, triggering transistor Q2 to output a large current. The current flowing through Q2-R10 generates a voltage that triggers silicon-controlled rectifier (thyristor) Q3 to conduct and remain on. As a result, some current no longer flows through RELAY-U1-GND, but instead flows through LED1-R5-Q3-GND. The magnetic field of relay coil RELAY weakens, causing the reset switch RESET to disconnect the input and output terminals. Because the thyristor Q3 remains on, the magnetic field in relay coil RELAY remains relatively weak, preventing the reset switch RESET from closing. Consequently, the leakage protection device cannot be reset even when the reset button is pressed. At this point, if the input power supply to the leakage protection device is disconnected, the thyristor rectifier Q3 turns off. Then, if the input power supply is reconnected, Q3 will remain off, and current will flow through RELAY-U1-GND again. This causes the leakage protection device to return to normal operation. Relay coil RELAY generates a relatively large magnetic field, keeping the reset switch RESET closed, thereby establishing an electrical connection between the input and output terminals. This implements the protection function described above: after a trip caused by overheating, the leakage protection device must be disconnected from the input power supply and then reconnected to it before normal operation can be resumed.

[0068] The leakage protection device disclosed in the present invention utilizes reasonable structural design and layout to achieve multiple fault protections in a relatively small space, and provides the functions of working status display and fault status display, effectively improving the experience comfort and safety.

[0069] It should be understood here that the embodiments shown in the figures only show the optional shapes, sizes and arrangements of the various optional components of the leakage protection device according to the present disclosure. However, they are only illustrative and not restrictive. Other shapes, sizes and arrangements may also be adopted without departing from the spirit and scope of the present disclosure.

[0070] The technical content and technical features of the present disclosure have been disclosed above. However, it is understood that, based on the creative ideas of the present disclosure, those skilled in the art may make various changes and improvements to the above-disclosed concepts, all of which fall within the scope of protection of the present disclosure. The description of the above embodiments is illustrative rather than restrictive, and the scope of protection of the present disclosure is determined by the claims.

Claims

1. A leakage protection device, comprising a housing and a core assembly disposed in the housing, characterized in that: The core assembly includes: an input terminal assembly, comprising at least a pair of plug blades extending out of the housing for coupling to an input terminal power source; Output terminal component, used for coupling load electrical appliances; an execution component, configured to control the connection state between the input-end component and the output-end component; A control circuit board, used to control the movement and state of the actuator; a temperature detecting member coupled to the control circuit board and arranged adjacent to the plug blade to detect a temperature of the plug blade; and a status indicator, the status indicator being coupled to the control circuit board and providing an indication in response to the temperature detected by the temperature detecting element, In which, the execution component is configured to place the input end component and the output end component in a disconnected state based on the detection temperature of the temperature detection component being greater than a preset temperature, and the status indicator provides a fault indication, and the control circuit board is configured to prevent the input end component and the output end component from being connected again before the input end power supply is disconnected, so that the output end component has no power output, that is, it is necessary to disconnect the input end power supply of the input end component or unplug the plug from the power socket, and then connect the input end power supply again or insert the plug into the power socket, so that the input end component and the output end component can be connected again.

2. The leakage protection device according to claim 1, characterized in that: The core assembly further includes a reset assembly configured to connect the input end assembly and the output end assembly again when the input end assembly and the output end assembly are in a disconnected state.

3. The leakage protection device according to claim 1, characterized in that: The status indicator indicates at least one of a power-on state, a power-off state, a leakage state, an overheating state, and a self-test fault state in response to the state of the movement assembly.

4. The leakage protection device according to claim 3, characterized in that: The state indicator includes an indicator light, which is in an off state, a lit state of a different color, or a flashing state of a different color in response to the state of the movement assembly.

5. The leakage protection device according to claim 4, characterized in that: The indicator light is configured to be in a lighting state or a flashing state of a first color in response to the core assembly being in an overheated state; Alternatively, the indicator light is configured to be lit in a second color in response to the core assembly being in a powered-on state, or the indicator light is configured to be off or flash in a second color in response to the core assembly being in a power leakage state; Alternatively, the indicator light is configured to be in a lighting state or a flashing state of a third color in response to the movement component being in a self-test fault state.

6. The leakage protection device according to claim 3, characterized in that: At least one status indication window is provided on the housing so as to directly observe one or more states of the movement assembly from outside the housing.

7. The leakage protection device according to claim 6, characterized in that: The status indicating window is provided with a light guide.

8. The leakage protection device according to claim 1, characterized in that: The input end component or the output end component is configured to include an elastic member, and the elastic member cooperates with the execution component to separate or contact the input end component and the output end component to be in a disconnected state or a connected state.

9. The leakage protection device according to claim 8, characterized in that: The actuator includes a coil assembly coupled to the control circuit board, a magnetic frame assembly, a reset plate and an iron core, wherein the coil assembly is placed in the magnetic frame assembly and is capable of generating a magnetic field when powered on and removing the magnetic field when powered off, wherein the iron core passes through the coil assembly and is configured to move in response to the powered on state or the powered off state of the coil assembly.

10. The leakage protection device according to claim 9, characterized in that: The reset plate is attached to the iron core so that when the coil assembly is energized, the iron core moves from an initial position to drive the reset plate so that the input end assembly and the output end assembly are in contact and in a connected state; and when the coil assembly is de-energized, the elastic member separates the input end assembly from the output end assembly so that they are in a disconnected state and drives the reset plate and the iron core to move to their initial positions.

11. The leakage protection device according to claim 10, characterized in that: The reset plate has a first end attached to the iron core and a second end adapted to abut against the elastic member. The reset plate is configured to pivot the first end and the second end around a pivot axis under the action of the iron core or the elastic member.

12. The leakage protection device according to claim 2, characterized in that: The reset assembly includes a reset switch coupled to the control circuit board and a reset button attached to the reset switch, wherein the reset button is exposed outside the housing.

13. The leakage protection device according to claim 1, characterized in that: The movement assembly includes a test assembly, which includes a test switch coupled to the control circuit board and a test button attached to the test switch, wherein the test button is exposed outside the housing.

14. The leakage protection device according to claim 1, characterized in that: The shell includes an upper shell and a lower shell attached to each other, the lower shell includes a first lower shell and a second lower shell attached to each other, and the leakage protection device includes at least a seal arranged between the upper shell and the lower shell and / or between the first lower shell and the second lower shell.

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