Earth leakage protection device, electric connection equipment and electric appliance

Abstract

The utility model provides a leakage protection device, electric connection equipment and an electric appliance. The apparatus includes: a switch module controlling a power connection between an input terminal and an output terminal; the electric leakage detection module is used for generating an electric leakage fault signal when the leakage current signal is detected or the leakage current signal exceeds a preset threshold value; the over-temperature protection module comprises a first temperature sensor and a second temperature sensor, the first temperature sensor is close to the first plug piece and detects the temperature near the first plug piece, and the second temperature sensor is close to the second plug piece and detects the temperature near the second plug piece; the over-temperature protection module generates an over-temperature fault signal when the temperature detected by the first temperature sensor and / or the second temperature sensor exceeds a preset threshold value; and the driving module responds to the electric leakage fault signal to drive the switch module to disconnect the electric power connection. According to the utility model, when the temperature of the plug sheets is too high, electric power connection can be cut off in time, dangers are avoided, and the over-temperature protection precision is high.

Description

Technical Field

[0001] This utility model relates to the electrical field, and in particular to a leakage current protection device, an electrical connection device, and an electrical appliance. Background Technology

[0002] To improve electrical safety, residual current devices (RCDs) are being used more and more widely, and their application areas and scenarios are continuously expanding. Existing RCDs provide basic leakage protection; when a leakage is detected at the load, the device quickly disconnects power to protect the user. However, in actual use, issues such as poor contact due to reduced socket clamping force or circuit overload often lead to localized overheating of the RCD. This can cause the device casing to melt or even start a fire, posing significant safety hazards and seriously endangering the lives and property of users. Utility Model Content

[0003] Based on the above problems, a first aspect of this utility model proposes a leakage current protection device, comprising: a switching module coupled between an input end and an output end of a current-carrying line, and configured to control the power connection between the input end and the output end, wherein the input end of the current-carrying line is connected to a first plug prong and a second plug prong; a leakage current detection module configured to detect a leakage current signal on the current-carrying line, and generate a leakage current fault signal when the leakage current signal is detected or when the leakage current signal exceeds a preset threshold; an over-temperature protection module including a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is positioned near the first plug prong and configured to detect the temperature near the first plug prong, and the second temperature sensor is positioned near the second plug prong and configured to detect the temperature near the second plug prong, wherein the over-temperature protection module is configured to generate an over-temperature fault signal when the temperature detected by the first temperature sensor and / or the second temperature sensor exceeds a preset threshold; and a driving module coupled to the switching module and the leakage current detection module, and configured to receive the leakage current fault signal and drive the switching module to disconnect the power connection in response to the leakage current fault signal.

[0004] In some embodiments, the over-temperature protection module further includes: a first voltage divider element connected in series with the first temperature sensor; a second voltage divider element connected in series with the second temperature sensor; and a first comparison unit coupled to the first voltage divider element and the second voltage divider element, wherein when the temperature detected by the first temperature sensor and / or the second temperature sensor exceeds the preset threshold, the first voltage divider element and / or the second voltage divider element provides an over-temperature detection signal to the first comparison unit, thereby causing the first comparison unit to generate the over-temperature fault signal.

[0005] In some embodiments, the over-temperature protection module further includes: a first isolation element coupled between the first temperature sensor and the first comparison unit; and a second isolation element coupled between the second temperature sensor and the first comparison unit, wherein the first isolation element and the second isolation element are configured to isolate the temperature detection signals of the first temperature sensor and the second temperature sensor.

[0006] In some embodiments, the first isolation element and the second isolation element are diodes, respectively.

[0007] In some embodiments, the leakage current detection module includes a leakage current detection chip, and the leakage current detection chip is coupled to the first comparison unit to provide a reference voltage to the first comparison unit; or the over-temperature protection module further includes a third voltage divider element and a fourth voltage divider element connected in series, the third voltage divider element and the fourth voltage divider element being coupled to the first comparison unit and configured to provide a reference voltage to the first comparison unit.

[0008] In some embodiments, the over-temperature protection module further includes: a first voltage divider element connected in series with the first temperature sensor; a second voltage divider element connected in series with the second temperature sensor; a first comparison unit coupled to the first voltage divider element; and a second comparison unit coupled to the second voltage divider element, wherein when the temperature detected by the first temperature sensor exceeds the preset threshold, the first voltage divider element provides an over-temperature detection signal to the first comparison unit, thereby causing the first comparison unit to generate the over-temperature fault signal; and / or when the temperature detected by the second temperature sensor exceeds the preset threshold, the second voltage divider element provides the over-temperature detection signal to the second comparison unit, thereby causing the second comparison unit to generate the over-temperature fault signal.

[0009] In some embodiments, the drive module is also coupled to the over-temperature protection module and is further configured to receive the over-temperature fault signal and, in response to the over-temperature fault signal, drive the switch module to disconnect the power connection.

[0010] In some embodiments, the drive module further includes: at least one first semiconductor element coupled to the leakage detection module and configured to receive the leakage fault signal and change the switching state in response to the leakage fault signal; and at least one second semiconductor element coupled to the over-temperature protection module and configured to receive the over-temperature fault signal and change the switching state in response to the over-temperature fault signal.

[0011] In some embodiments, the drive module further includes a reset switch, which is operable to: drive the switch module to reconnect the power connection when the drive module drives the switch module to disconnect the power connection in response to the leakage fault signal, and maintain the disconnected state of the power connection when the drive module drives the switch module to disconnect the power connection in response to the over-temperature fault signal.

[0012] In some embodiments, the leakage protection device further includes: an over-temperature self-test module coupled to the over-temperature protection module and the drive module, configured to detect whether the over-temperature protection module has failed, and generate an over-temperature self-test fault signal when the over-temperature protection module fails; and the drive module is further configured to receive the over-temperature self-test fault signal and drive the switch module to disconnect the power connection in response to the over-temperature self-test fault signal.

[0013] In some embodiments, the over-temperature self-test module includes a third comparison unit coupled to the first temperature sensor and the second temperature sensor, and configured to be triggered to generate the over-temperature self-test fault signal when the first temperature sensor and the second temperature sensor fail.

[0014] In some embodiments, the over-temperature self-test module further includes: a first voltage regulator component coupled to the first temperature sensor and the third comparison unit; and a second voltage regulator component coupled to the second temperature sensor and the third comparison unit, wherein the first voltage regulator component and the second voltage regulator component are configured to increase the trigger voltage of the third comparison unit.

[0015] In some embodiments, the over-temperature self-test module further includes: a third isolation element coupled between the first temperature sensor and the third comparison unit; and a fourth isolation element coupled between the second temperature sensor and the third comparison unit, wherein the third isolation element and the fourth isolation element are configured to isolate the temperature detection signals of the first temperature sensor and the second temperature sensor.

[0016] In some embodiments, the leakage current protection device further includes: a leakage current self-test module coupled to the leakage current detection module and the drive module, and configured to periodically generate a simulated leakage current signal to detect whether the leakage current detection module and / or the drive module has failed, and to generate a leakage current self-test fault signal when the leakage current detection module and / or the drive module fails; and the drive module is further configured to receive the leakage current self-test fault signal and drive the switch module to disconnect the power connection in response to the leakage current self-test fault signal.

[0017] The leakage current protection device provided in the first aspect of this utility model includes an over-temperature protection module. By setting temperature sensors near the two plug prongs respectively, the temperature of the two plug prongs can be accurately and independently detected, improving the accuracy of over-temperature protection. When the plug prong temperature is too high, an over-temperature fault signal can be issued to avoid danger, eliminate potential safety hazards, and increase the safety of the leakage current protection device.

[0018] A second aspect of this invention provides a leakage current protection device, comprising: a switching module coupled between an input end and an output end of a current-carrying line, configured to control the power connection between the input end and the output end; a leakage current detection module configured to detect a leakage current signal on the current-carrying line, and generate a leakage current fault signal when the leakage current signal is detected or when the leakage current signal exceeds a preset threshold; an over-temperature protection module configured to detect the temperature of a specific component and / or a specific location, and generate an over-temperature fault signal when the temperature of the specific component and / or the specific location exceeds a preset threshold; and a driving module coupled to the switching module, the driving module comprising: at least one first semiconductor element coupled to the leakage current detection module, configured to receive the leakage current fault signal and change a switching state in response to the leakage current fault signal, thereby driving the switching module to disconnect the power connection; and at least one second semiconductor element coupled to the over-temperature protection module, configured to receive the over-temperature fault signal and change a switching state in response to the over-temperature fault signal, thereby driving the switching module to disconnect the power connection.

[0019] In some embodiments, the drive module further includes a reset switch operable to: drive the switch module to reconnect the power connection when at least one first semiconductor element drives the switch module to disconnect the power connection in response to the leakage fault signal, and maintain the disconnected state of the power connection when at least one second semiconductor element drives the switch module to disconnect the power connection in response to the over-temperature fault signal.

[0020] In some embodiments, the leakage protection device further includes: an over-temperature self-test module coupled to the over-temperature protection module and the drive module, configured to detect whether the over-temperature protection module has failed, and generate an over-temperature self-test fault signal when the over-temperature protection module fails. The at least one second semiconductor element is also configured to receive the over-temperature self-test fault signal and change the switching state in response to the over-temperature self-test fault signal, thereby driving the switching module to disconnect the power connection.

[0021] In some embodiments, the over-temperature protection module includes at least one temperature sensor, and the over-temperature self-test module includes a third comparison unit coupled to the at least one temperature sensor and configured to be triggered to generate the over-temperature self-test fault signal when the at least one temperature sensor fails.

[0022] In some embodiments, the over-temperature self-test module further includes at least one voltage regulator component coupled to the at least one temperature sensor and the third comparison unit, wherein the at least one voltage regulator component is configured to increase the trigger voltage of the third comparison unit.

[0023] The leakage current protection device provided in the second aspect of this utility model achieves the independence of the two functions of leakage current protection and over-temperature protection by setting different semiconductor elements for the leakage current detection module and the over-temperature protection module respectively to drive the switching module, thereby further increasing the safety of the leakage current protection device.

[0024] A third aspect of this utility model provides a leakage current protection device, comprising: a switching module coupled between an input terminal and an output terminal of a current-carrying line, configured to control the power connection between the input terminal and the output terminal; a leakage current detection module configured to detect a leakage current signal on the current-carrying line, and generate a leakage current fault signal when the leakage current signal is detected or when the leakage current signal exceeds a preset threshold; an over-temperature protection module configured to detect the temperature of a specific component and / or a specific location, and generate an over-temperature fault signal when the temperature of the specific component and / or the specific location exceeds a preset threshold; and an over-temperature self-test. A module coupled to the over-temperature protection module and configured to detect whether the over-temperature protection module has failed, and generate an over-temperature self-test fault signal when the over-temperature protection module fails; and a drive module coupled to the switch module, the leakage current detection module, the over-temperature protection module and the over-temperature self-test module, and configured to receive the leakage current fault signal, the over-temperature fault signal and the over-temperature self-test fault signal, and drive the switch module to disconnect the power connection in response to one or more of the leakage current fault signal, the over-temperature fault signal and the over-temperature self-test fault signal.

[0025] In some embodiments, the over-temperature protection module includes at least one temperature sensor, and the over-temperature self-test module includes a third comparison unit coupled to the at least one temperature sensor and configured to be triggered to generate the over-temperature self-test fault signal when the at least one temperature sensor fails.

[0026] In some embodiments, the over-temperature self-test module further includes at least one voltage regulator component coupled to the at least one temperature sensor and the third comparison unit, wherein the at least one voltage regulator component is configured to increase the trigger voltage of the third comparison unit.

[0027] The leakage current protection device provided in the third aspect of this utility model has an over-temperature self-test module to self-test the over-temperature protection function of the device, and cuts off the power connection when the over-temperature protection function fails, which further increases the safety of the leakage current protection device.

[0028] A fourth aspect of this utility model provides an electrical connection device comprising: a housing; and a leakage current protection device according to any one of the embodiments of the first, second, and third aspects, the leakage current protection device being housed in the housing.

[0029] The fifth aspect of this utility model provides an electrical appliance comprising: a load device; and an electrical connection device according to any one of the embodiments of the fourth aspect, coupled to the load device for supplying power to the load device. Attached Figure Description

[0030] Embodiments are illustrated and explained with reference to the accompanying drawings. These drawings are used to illustrate the basic principles and thus only show aspects necessary for understanding the basic principles. These drawings are not to scale. In the drawings, the same reference numerals denote similar features. Furthermore, lines connecting each block in the architectural diagram indicate electrical coupling between the two blocks; the absence of a line between two blocks does not indicate that the two blocks are not coupled.

[0031] Figure 1 A schematic architectural diagram of a leakage current protection device according to an embodiment of the present invention is shown;

[0032] Figure 2 A schematic architectural diagram of a leakage current protection device according to an embodiment of the present invention is shown;

[0033] Figure 3 A schematic architectural diagram of a leakage current protection device according to an embodiment of the present invention is shown;

[0034] Figure 4 A schematic diagram of a leakage current protection device according to an embodiment of the present invention is shown;

[0035] Figure 5A A schematic diagram of an over-temperature protection module according to an embodiment of the present invention is shown.

[0036] Figure 5B A schematic diagram of an over-temperature protection module and a portion of a drive module according to an embodiment of the present invention is shown.

[0037] Figure 5C A schematic diagram of an over-temperature protection module and a portion of a drive module according to an embodiment of the present invention is shown.

[0038] Figure 5D A schematic diagram of an over-temperature protection module, an over-temperature self-test module, and a portion of a drive module according to an embodiment of the present invention is shown.

[0039] Figure 5E A schematic diagram of an over-temperature protection module, an over-temperature self-test module, and a portion of a drive module according to an embodiment of the present invention is shown.

[0040] Figure 5F A schematic diagram of an over-temperature protection module and a portion of a drive module according to an embodiment of the present invention is shown.

[0041] Figure 6 A schematic diagram of a leakage current protection device according to an embodiment of the present invention is shown. Detailed Implementation

[0042] In the following detailed description of preferred embodiments, reference will be made to the accompanying drawings, which form part of this invention. The accompanying drawings illustrate specific embodiments that can implement this invention by way of example. The exemplary embodiments are not intended to be exhaustive of all embodiments according to this invention. It will be understood that other embodiments and structural or logical modifications may be made without departing from the scope of this invention. Therefore, the following detailed description is not restrictive, and the scope of this invention is defined by the appended claims.

[0043] Before introducing the embodiments of this utility model, some of the terms involved in this utility model will be explained in order to better understand this utility model.

[0044] The terms "connection" or "coupling" and similar terms used in this invention are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Words such as "a," "a group," or "one" do not indicate a quantity limitation, but rather indicate the presence of at least one.

[0045] The terms "comprising," "including," and similar terms used in this utility model should be understood as open-ended terms, meaning "including / including but not limited to," indicating that other content may also be included. The term "based on" means "at least partially based on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment," and so on. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

[0046] Figure 1 A schematic architectural diagram of a leakage current protection device according to an embodiment of the present invention is shown. Figure 1 As shown, the leakage current protection device 100 includes a switching module 103, a leakage current detection module 104, an over-temperature protection module 105, and a drive module 106. The switching module 103 is coupled between the input terminal 101 and the output terminal 102 of the current-carrying line and controls the electrical connection between them. The input terminal 101 of the current-carrying line is connected to a first plug prong and a second plug prong. The current-carrying line may include a first current-carrying line (L) for connecting to the live wire of the power grid and a second current-carrying line (N) for connecting to the neutral wire of the power grid. When the first plug prong and the second plug prong are inserted into a power port (such as a socket), the current-carrying line is connected to the live wire and the neutral wire of the power grid. The leakage current detection module 104 detects leakage current signals on the current-carrying line and generates a leakage fault signal when a leakage current signal is detected or when the leakage current signal exceeds a preset threshold. The over-temperature protection module 105 includes a first temperature sensor 1051 and a second temperature sensor 1052. The first temperature sensor 1051 is configured to be near the first plug prong and detect the temperature near the first plug prong. The second temperature sensor 1052 is positioned near the second plug prong and detects the temperature in the vicinity of the second plug prong. The first and second temperature sensors 1051 and 1052 can be thermistors, diodes, and / or bimetallic switches. The over-temperature protection module 105 generates an over-temperature fault signal when the temperature detected by the first temperature sensor 1051 and / or the second temperature sensor 1052 exceeds a preset threshold. The drive module 106 is coupled to the switch module 103 and the leakage current detection module 104, receives the leakage current fault signal, and drives the switch module 103 to disconnect the power connection in response to the leakage current fault signal.

[0047] The leakage current protection device 100 in this embodiment includes an over-temperature protection module 105. By placing temperature sensors near the two plug prongs respectively, the temperature of the two plug prongs can be accurately and independently detected, improving the accuracy of over-temperature protection. When the plug prong temperature is too high, an over-temperature fault signal can be issued to avoid danger, eliminate potential safety hazards, and increase the safety of the leakage current protection device.

[0048] In some embodiments, the over-temperature protection module 105 further includes a first voltage divider element, a second voltage divider element, and a first comparison unit. The first voltage divider element is connected in series with the first temperature sensor 1051, and the second voltage divider element is connected in series with the second temperature sensor 1052. The first comparison unit is coupled to the first and second voltage divider elements. The first and second voltage divider elements may be, for example, resistors, inductors, or capacitors. The first comparison unit may be, for example, a trigger diode, a transistor, a field-effect transistor, and / or a comparator. When the temperature detected by the first temperature sensor 1051 and / or the second temperature sensor 1052 exceeds a preset threshold, the first voltage divider element and / or the second voltage divider element provide an over-temperature detection signal to the first comparison unit, thereby causing the first comparison unit to generate an over-temperature fault signal.

[0049] In some embodiments, the over-temperature protection module 105 further includes a first isolation element and a second isolation element. The first isolation element is coupled between the first temperature sensor 1051 and the first comparison unit, and the second isolation element is coupled between the second temperature sensor 1052 and the first comparison unit. The first and second isolation elements isolate the temperature detection signals of the first temperature sensor 1051 and the second temperature sensor 1052. The first and second isolation elements can be, for example, diodes. By providing isolation elements in the over-temperature protection module 105, the detection results of the two temperature sensors can be made independent of each other, achieving temperature detection independence and further improving the accuracy of over-temperature protection.

[0050] In some embodiments, the leakage current detection module 104 includes a leakage current detection chip. The leakage current detection chip is coupled to a first comparison unit to provide a reference voltage to the first comparison unit. Alternatively, the over-temperature protection module further includes a third voltage divider element and a fourth voltage divider element connected in series. The third voltage divider element and the fourth voltage divider element are coupled to the first comparison unit and provide a reference voltage to the first comparison unit.

[0051] In some embodiments, the over-temperature protection module 105 further includes a first voltage divider element, a second voltage divider element, a first comparison unit, and a second comparison unit. The first voltage divider element is connected in series with the first temperature sensor 1051, and the second voltage divider element is connected in series with the second temperature sensor 1052. The first and second comparison units may be, for example, trigger diodes, transistors, field-effect transistors, and / or comparators. The first comparison unit is coupled to the first voltage divider element, and the second comparison unit is coupled to the second voltage divider element. When the temperature detected by the first temperature sensor 1051 exceeds a preset threshold, the first voltage divider element provides an over-temperature detection signal to the first comparison unit, thereby causing the first comparison unit to generate an over-temperature fault signal. When the temperature detected by the second temperature sensor 1052 exceeds the preset threshold, the second voltage divider element provides an over-temperature detection signal to the second comparison unit, thereby causing the second comparison unit to generate an over-temperature fault signal. By setting two comparison units for each of the two temperature sensors, the detection results of the two temperature sensors can be made independent of each other, achieving temperature detection independence and further improving the accuracy of over-temperature protection.

[0052] In some embodiments, the drive module 106 is also coupled to the over-temperature protection module 105, receives an over-temperature fault signal, and drives the switch module 103 to disconnect the power connection in response to the over-temperature fault signal. By coupling the drive module 106 to the over-temperature protection module 105, the power connection can be promptly cut off by the drive module 106 when the plug temperature is too high, eliminating safety hazards when the user is not paying attention or is not present, and further increasing the safety of the leakage protection device.

[0053] In some embodiments, the drive module 106 further includes at least one first semiconductor element and at least one second semiconductor element. The at least one first semiconductor element is coupled to the leakage current detection module 104, receives a leakage current fault signal, and changes its switching state in response to the leakage current fault signal. The at least one second semiconductor element is coupled to the over-temperature protection module 105, receives an over-temperature fault signal, and changes its switching state in response to the over-temperature fault signal. By using different semiconductor elements to drive the switch module 103 for the leakage current detection module 104 and the over-temperature protection module 105 respectively, the independence of the two functions of leakage current protection and over-temperature protection is achieved, further increasing the safety of the leakage current protection device.

[0054] In some embodiments, the drive module 106 further includes a reset switch, which can be operated to: reconnect the power connection when the drive module 106 disconnects the power connection in response to a leakage fault signal, and maintain the disconnected state of the power connection when the drive module 106 disconnects the power connection in response to an over-temperature fault signal.

[0055] In some embodiments, the leakage current protection device 100 further includes an over-temperature self-test module coupled to the over-temperature protection module 105 and the drive module 106. This module detects whether the over-temperature protection module 105 has malfunctioned and generates an over-temperature self-test fault signal when the over-temperature protection module 105 malfunctions. The drive module 106 receives the over-temperature self-test fault signal and, in response, drives the switch module 103 to disconnect the power connection. By providing the over-temperature self-test module, the power connection can be promptly cut off when the over-temperature protection module 105 malfunctions (such as the first temperature sensor 1051 and / or the second temperature sensor 1052 fails), further increasing the safety of the leakage current protection device.

[0056] In some embodiments, the over-temperature self-test module includes a third comparison unit coupled to the first temperature sensor 1051 and the second temperature sensor 1052, which is triggered to generate an over-temperature self-test fault signal when the first temperature sensor 1051 and the second temperature sensor 1052 fail. The third comparison unit may be, for example, a trigger diode, a transistor, a field-effect transistor, and / or a comparator.

[0057] In some embodiments, the over-temperature self-test module further includes a first voltage regulator component and a second voltage regulator component. The first voltage regulator component is coupled to a first temperature sensor 1051 and a third comparator unit. The second voltage regulator component is coupled to a second temperature sensor 1052 and a third comparator unit. The first and second voltage regulator components are used to increase the trigger voltage of the third comparator unit. The first and second voltage regulator components may, for example, each include a combination of a resistor and a Zener diode.

[0058] In some embodiments, the over-temperature self-test module further includes a third isolation element and a fourth isolation element. The third isolation element is coupled between the first temperature sensor 1051 and the third comparison unit, and the fourth isolation element is coupled between the second temperature sensor 1052 and the third comparison unit. The third and fourth isolation elements isolate the temperature detection signals of the first temperature sensor 1051 and the second temperature sensor 1052. The third and fourth isolation elements can be, for example, diodes. By providing isolation elements in the over-temperature self-test module, the detection results of the two temperature sensors can be made independent of each other, achieving independence in temperature detection.

[0059] In some embodiments, the residual current device 100 further includes a residual current self-test module coupled to the residual current detection module 104 and the drive module 106. The residual current self-test module periodically generates simulated leakage current signals to detect whether the residual current detection module 104 and / or the drive module 106 has failed, and generates a self-test fault signal when the residual current detection module 104 and / or the drive module 106 fails. The drive module 106 receives the residual current self-test fault signal and, in response to the signal, drives the switch module 103 to disconnect the power connection. By incorporating a residual current self-test module in the residual current device 100, the power connection can be promptly disconnected when the residual current detection module 104 and / or the drive module 106 fails, further enhancing the safety of the residual current device.

[0060] Figure 2 A schematic architectural diagram of a leakage current protection device according to an embodiment of the present invention is shown. Figure 2 As shown, the leakage current protection device 200 includes a switching module 203, a leakage current detection module 204, an over-temperature protection module 205, and a drive module 206. The switching module 203 is coupled between the input terminal 201 and the output terminal 202 of the current-carrying line and controls the electrical connection between them. The current-carrying line may include a first current-carrying line (L) for connection to the live wire of the power grid and a second current-carrying line (N) for connection to the neutral wire. The leakage current detection module 204 detects leakage current signals on the current-carrying line and generates a leakage fault signal when a leakage current signal is detected or when the leakage current signal exceeds a preset threshold. The over-temperature protection module 205 may include, for example, at least one temperature sensor that detects the temperature of a specific component and / or a specific location and generates an over-temperature fault signal when the temperature of the specific component and / or the specific location exceeds a preset threshold. The drive module 206 is coupled to the switching module 203 and includes at least one first semiconductor element 2061 and at least one second semiconductor element 2061. At least one first semiconductor element 2061 is coupled to the leakage current detection module 204, receives a leakage current fault signal, and changes its switching state in response to the leakage current fault signal, thereby driving the switch module 203 to disconnect the power connection. At least one second semiconductor element 2062 is coupled to the over-temperature protection module 205, receives an over-temperature fault signal, and changes its switching state in response to the over-temperature fault signal, thereby driving the switch module 203 to disconnect the power connection.

[0061] In this embodiment, the leakage current protection device 200 drives the switching module 203 by setting different semiconductor elements for the leakage current detection module 204 and the over-temperature protection module 205, thereby realizing the independence of the two functions of leakage current protection and over-temperature protection and further increasing the safety of the leakage current protection device 200.

[0062] In some embodiments, the drive module 206 further includes a reset switch operable to: reconnect the power connection to the switch module 203 when at least one first semiconductor element 2061 disconnects the power connection in response to a leakage fault signal, and maintain the disconnected power connection when at least one second semiconductor element 2062 disconnects the power connection in response to an over-temperature fault signal. This prevents the user from resetting the leakage current protection device 200 by operating the reset switch in the event of an over-temperature protection disconnection; instead, the user must unplug the connector to check before reusing the device, further increasing the safety of the leakage current protection device 200.

[0063] In some embodiments, the leakage current protection device 200 further includes an over-temperature self-test module coupled to the over-temperature protection module 205 and the drive module 206. The over-temperature self-test module detects whether the over-temperature protection module 205 has failed and generates an over-temperature self-test fault signal when the over-temperature protection module 205 fails. At least one second semiconductor element 2062 also receives the over-temperature self-test fault signal and changes its switching state in response to the over-temperature self-test fault signal, thereby driving the switch module 203 to disconnect the power connection.

[0064] In some embodiments, the over-temperature protection module 205 includes at least one temperature sensor, and the over-temperature self-test module includes a third comparison unit. The third comparison unit is coupled to the at least one temperature sensor and is triggered to generate an over-temperature self-test fault signal when the at least one temperature sensor fails.

[0065] In some embodiments, the over-temperature self-test module further includes at least one voltage regulator component coupled to at least one temperature sensor and a third comparison unit. The at least one voltage regulator component is used to increase the trigger voltage of the third comparison unit.

[0066] Figure 3 A schematic architectural diagram of a leakage current protection device according to an embodiment of the present invention is shown. Figure 3As shown, the leakage current protection device 300 includes a switch module 303, a leakage current detection module 304, an over-temperature protection module 305, a drive module 306, and an over-temperature self-test module 307. The switch module 303 is coupled between the input terminal 301 and the output terminal 302 of the current-carrying line and controls the electrical connection between them. The current-carrying line may include a first current-carrying line (L) for connecting to the live wire of the power grid and a second current-carrying line (N) for connecting to the neutral wire of the power grid. The leakage current detection module 304 detects leakage current signals on the current-carrying line and generates a leakage fault signal when a leakage current signal is detected or when the leakage current signal exceeds a preset threshold. The over-temperature protection module 305 may include, for example, at least one temperature sensor that detects the temperature of a specific component and / or a specific location and generates an over-temperature fault signal when the temperature of the specific component and / or the specific location exceeds a preset threshold. An over-temperature self-test module 307 is coupled to an over-temperature protection module 305, detects whether the over-temperature protection module 305 has malfunctioned, and generates an over-temperature self-test fault signal when the over-temperature protection module 305 malfunctions. A drive module 306 is coupled to a switch module 303, a leakage current detection module 304, an over-temperature protection module 305, and an over-temperature self-test module 307. The drive module 306 receives a leakage current fault signal, an over-temperature fault signal, and an over-temperature self-test fault signal, and drives the switch module 303 to disconnect the power connection in response to one or more of these signals.

[0067] In some embodiments, the over-temperature protection module 305 includes at least one temperature sensor, and the over-temperature self-test module includes a third comparison unit. The third comparison unit is coupled to the at least one temperature sensor and is triggered to generate an over-temperature self-test fault signal when the at least one temperature sensor fails.

[0068] In some embodiments, the over-temperature self-test module further includes at least one voltage regulator component coupled to at least one temperature sensor and a third comparison unit. The at least one voltage regulator component is used to increase the trigger voltage of the third comparison unit.

[0069] The leakage current protection device 300 in this embodiment performs a self-test on the over-temperature protection function by setting an over-temperature self-test module, and cuts off the power connection when the over-temperature protection function fails, further increasing the safety of the leakage current protection device 300.

[0070] Figure 4 A schematic diagram of a leakage current protection device according to an embodiment of the present invention is shown. Figures 5A-5F Several schematic diagrams of the over-temperature protection module, the over-temperature self-test module, and / or the drive module are shown respectively.

[0071] First refer to Figure 4 and Figure 5AThe leakage current protection device 400 is coupled between the input terminal LINE and the load device LOAD, and includes a switch module 403, a leakage current detection module 404, an over-temperature protection module 405, a drive module 406, and a leakage current self-test module 407. The input terminal LINE is connected to the first plug prong and the second plug prong (…). Figure 4 (Not shown in the image). The leakage current detection module 404 includes a leakage current detection ring ZCT1, a leakage current detection chip U1, and its surrounding circuitry. The first current-carrying line HOT 41 and the second current-carrying line WHITE 42 pass through the leakage current detection ring ZCT1. The switching module 403 is used to control the power connection between the first current-carrying line 41 and the second current-carrying line 42. The over-temperature protection module 405 includes thermistors T1 (first temperature sensor) and T2 (second temperature sensor), resistors R28 (first voltage divider element) and R29 (second voltage divider element), diodes D6 (first isolation element) and D7 (second isolation element), transistor Q6 (first comparator unit), and light-emitting diode LED3. Thermistor T1 is positioned near the first connector and is used to detect the temperature near the first connector. Thermistor T2 is positioned near the second connector and is used to detect the temperature near the second connector. Thermistor T1 is connected in series with resistor R28. Thermistor T2 is connected in series with resistor R29, and then connected in parallel with thermistor T1 and resistor R28. The anode of diode D6 is connected to thermistor T1, and the cathode is connected to the emitter of transistor Q6. The anode of diode Q7 is connected to thermistor T2, and the cathode is also connected to the emitter of transistor Q6. Diodes D6 and D7 are used to isolate the temperature detection of thermistors T1 and T2. Pin 6 of leakage current detection chip U1 is connected to the terminal N1 where thermistors T1 and T2 are connected, to provide power to them. Pin 3 of leakage current detection chip U1 is connected to the base of transistor Q6 to provide a reference voltage. The drive module 406 includes a switch drive element (such as coil RELAY), two thyristors Q1 and Q2 (first semiconductor elements), and a reset switch RESET. The leakage current self-test module 407 includes a trigger diode ZD1, capacitor C13, thyristor Q4, and some peripheral components. In other embodiments, the thyristor Q4 can be omitted, and instead, the thyristor Q1 and / or Q2 can be shared with the drive module 406. That is, the thyristor Q1 and / or Q2 can be connected in parallel with the capacitor C13 to provide a charge discharge path for the capacitor C13 when it is turned on.

[0072] Under normal circumstances, current charges capacitor C10 through HOT-R2-C6-DB1-C10. When the voltage across capacitor C10 rises to a level where the voltage across resistors R10 and R18 exceeds the trigger voltage of SCR Q3, SCR Q3 conducts. Current then flows through SCR Q3 via HOT-R2-C6-DB1-R8-RELAY-LED1, causing a current change in the RELAY coil. This generates a magnetic field, driving switch module 403 to close, connecting the power between input terminal LINE and output terminal LOAD. LED1 then lights up.

[0073] Simultaneously, current flows through HOT-R2-D1-R4 to power the leakage current detection chip U1, generating a stable voltage at the power supply pin (pin 6) of the leakage current detection chip U1. When leakage current exists on the first current-carrying line 41 or the second current-carrying line 42, the leakage current detection ring ZCT1 detects the leakage current signal and generates a corresponding induction signal at its secondary side. The leakage current detection ring ZCT1 is coupled to the leakage current detection chip U1, transmitting the induction signal to the leakage current detection chip U1 for processing. When the processed leakage current value is greater than a set threshold, pin 5 of the leakage current detection chip U1 outputs a high level (leakage fault signal); otherwise, it outputs a low level. The high level at pin 5 of the leakage current detection chip U1 is provided to the control electrodes of thyristors Q1 and Q2 via diode D3 and resistors R13 and R16, triggering thyristors Q1 and / or Q2 to conduct. At this time, current flows to ground through R8-Q1 / Q2 and no longer flows through coil RELAY, causing coil RELAY to lose power and the magnetic field to disappear. Switch module 403 disconnects the power connection between input terminal LINE and output terminal LOAD. The user can reset the circuit by operating the reset switch RESET. Specifically, pressing the reset switch RESET turns off thyristors Q1 and Q2, and the current flows again through thyristor Q3 via HOT-R2-C6-DB1-R8-RELAY-LED1. The current in coil RELAY changes again, generating a magnetic field, which drives switch module 403 to close, connecting the power connection between input terminal LINE and output terminal LOAD, and the leakage current protection device 400 is successfully reset.

[0074] The leakage current protection device 400 also has a leakage current self-test function. Current charges capacitor C13 through HOT-D4-R17. As the voltage across capacitor C13 increases, the voltage across trigger diode ZD1 also increases. After a preset time period, the voltage across capacitor C13 exceeds the trigger voltage of trigger diode ZD1, causing ZD1 to conduct. Current then flows through trigger diode ZD1-R7-ZCT1-ground to generate a simulated leakage current signal, while simultaneously charging capacitor C8 through resistor R9. Under normal operating conditions of the leakage current protection device 400, i.e., when both the leakage current detection module 404 and the drive module 406 are working normally, the leakage current detection ring ZCT1 detects the simulated leakage current signal. Its secondary side generates a corresponding induced signal and transmits it to the leakage current detection chip U1. Pin 5 of the leakage current detection chip U1 outputs a high level. Current flows through resistors R13 and R16 to charge capacitors C12 and C14. Simultaneously, current flows through R15 to trigger the thyristor Q4 to conduct. Capacitor C13 quickly releases its charge through the thyristor Q4, and its upper voltage drops rapidly. When the voltage drops below the trigger voltage of trigger diode ZD1, trigger diode ZD1 is cut off, and the simulated leakage current signal cannot be generated. Pin 5 of the leakage current detection chip U1 stops outputting a high level. Due to the short trigger time, the upper voltage of capacitors C12, C14, and C8 is low at this time, insufficient to trigger thyristors Q1 and / or Q2 to conduct, and the switch module 403 remains closed.

[0075] When the leakage current detection module 404 malfunctions and cannot detect the simulated leakage current signal, pin 5 of the leakage current detection chip U1 remains at a low level, preventing the thyristor Q4 from turning on. Capacitor C13 cannot release its charge through thyristor Q4, causing diode ZD1 to conduct for an extended period. This results in a continuous rise in the voltage across capacitor C8, and current continuously charges capacitors C12 and C14 through resistors R13 and R16 (generating a self-test fault signal), raising the voltage across capacitors C12 and C14 to a certain level. If the drive module 406 is functioning normally, thyristors Q1 and Q2 are turned on, and current flows to ground through R8-Q1 / Q2, no longer flowing through coil RELAY. This causes coil RELAY to lose power, the magnetic field disappears, and the switch module 403 disconnects the power connection between the input terminal LINE and the output terminal LOAD.

[0076] The leakage current protection device 400 also has an over-temperature protection function. Under normal temperature, the resistance of thermistors T1 and T2 is relatively high, therefore the voltage across resistors R28 and R29 is low, lower than the base voltage of transistor Q6 (i.e., the reference voltage provided by pin 6 of the leakage current detection chip U1), and transistor Q6 is cut off. When the temperature detected by thermistors T1 and / or T2 rises, their resistance decreases accordingly, and the voltage across resistors R28 and / or R29 rises. When the temperature detected by thermistors T1 and / or T2 exceeds a preset threshold, the voltage across resistors R28 and / or R29 (i.e., the over-temperature detection signal) exceeds the base voltage of transistor Q6, and transistor Q6 conducts. Current flows through thermistors T1 / T2, diodes D6 / D7, and then through transistor Q6, generating an over-temperature fault signal. LED3 is illuminated, indicating to the user that the product temperature is too high.

[0077] The following is for reference. Figure 4 and Figure 5B .exist Figure 5B In the schematic diagram, besides the over-temperature protection module 405, another part of the drive module 406 circuit is also shown. Figure 5A The difference is, Figure 5B The over-temperature protection module 405 also includes resistors R14 (third voltage divider element) and R24 (fourth voltage divider element) connected in series. These are connected to the base of transistor Q6 (first comparator unit) to provide a base voltage to transistor Q6. Additionally, the drive module 406 includes a thyristor Q5 (second semiconductor element) connected to transistor Q6 and its surrounding circuitry. One end (N2) of the parallel connection between resistor R22 and LED3 is connected to... Figure 4 The resistor R8 in the middle.

[0078] At normal temperatures, thermistors T1 and T2 have relatively high resistances, resulting in a low voltage across resistors R28 and R29, which is lower than the base voltage of transistor Q6 (i.e., the reference voltage provided by the voltage divider through resistors R14 and R24), causing transistor Q6 to be cut off. When the temperature detected by thermistors T1 and / or T2 rises, their resistance decreases accordingly, and the voltage across resistors R28 and / or R29 increases.

[0079] When the temperature detected by thermistors T1 and / or T2 exceeds a preset threshold, the voltage across resistors R28 and / or R29 (i.e., the over-temperature detection signal) exceeds the base voltage of transistor Q6, causing transistor Q6 to conduct. Current flows through thermistors T1 / T2, diodes D6 / D7, and transistor Q6, generating an over-temperature fault signal and triggering the SCR Q5 to conduct. Most of the current flows to ground via HOT-R2-C6-DB1-LED3-R25-Q5. LED3 is illuminated, indicating to the user that the product temperature is too high. Simultaneously, since most of the current no longer flows through coil RELAY, the magnetic field weakens, making it impossible to maintain the closed state of switch module 403. Switch module 403 then disconnects the power connection between input terminal LINE and output terminal LOAD.

[0080] Because the reset switch RESET is not connected in parallel with the thyristor Q5, even if the user presses the reset switch RESET, the thyristor Q5 cannot be turned off, and most of the current will not flow through the coil RELAY again. The user must remove the product from the power port, check the heat, and then plug it back into the power port. Only after the leakage protection device 400 is powered on again can it be successfully reset, allowing the switch module 403 to reconnect the power between the input terminal LINE and the output terminal LOAD.

[0081] The following is for reference. Figure 4 and Figure 5C .and Figure 5B The difference is, Figure 5C The over-temperature protection module 405 includes two transistors, Q6 (first comparator unit) and Q8 (second comparator unit). The emitter of transistor Q6 is connected to thermistor T1, and the emitter of transistor Q8 is connected to thermistor T2. Resistors R14 (third voltage divider element) and R24 (fourth voltage divider element) are connected to the bases of transistors Q6 and Q8 to provide base voltage to transistors Q6 and Q8. Figure 5C Instead of diodes D6 and D7 (isolation components), transistors Q6 and Q8 are used for thermistors T1 and T2 respectively to ensure the independence of temperature detection for thermistors T1 and T2.

[0082] At normal temperatures, the resistances of thermistors T1 and T2 are relatively large, resulting in a lower voltage across resistors R28 and R29, which is lower than the base voltage of transistors Q6 and Q8 (i.e., the reference voltage provided by the voltage divider through resistors R14 and R24). As a result, transistors Q6 and Q8 are cut off.

[0083] When the temperature detected by thermistor T1 rises, its resistance decreases accordingly, and the voltage across resistor R28 increases. When the temperature detected by thermistor T1 exceeds a preset threshold, the voltage across resistor R28 (i.e., the over-temperature detection signal) exceeds the base voltage of transistor Q6, causing transistor Q6 to conduct. Current flows through thermistor T1 and transistor Q6, generating an over-temperature fault signal and triggering the SCR Q5 to conduct. Most of the current flows to ground via HOT-R2-C6-DB1-LED3-R25-Q5. LED3 is illuminated, indicating to the user that the product temperature is too high. Simultaneously, since most of the current no longer flows through coil RELAY, the magnetic field weakens, making it impossible to maintain the closure of switch module 403. Switch module 403 then disconnects the power connection between input terminal LINE and output terminal LOAD.

[0084] Similarly, when the temperature detected by thermistor T2 rises, its resistance decreases accordingly, and the voltage across resistor R29 increases. When the temperature detected by thermistor T2 exceeds a preset threshold, the voltage across resistor R29 (i.e., the over-temperature detection signal) exceeds the base voltage of transistor Q8, causing transistor Q8 to conduct. Current flows through thermistor T2 and transistor Q8, generating an over-temperature fault signal and triggering the SCR Q5 to conduct. Most of the current flows to ground via HOT-R2-C6-DB1-LED3-R25-Q5. LED3 is illuminated, indicating to the user that the product temperature is too high. Simultaneously, since most of the current no longer flows through coil RELAY, the magnetic field weakens, making it impossible to maintain the switch module closed. Switch module 403 disconnects the power connection between input terminal LINE and output terminal LOAD.

[0085] Because the reset switch RESET is not connected in parallel with the thyristor Q5, even if the user presses the reset switch RESET, the thyristor Q5 cannot be turned off, and current will not flow through the coil RELAY again. The user must remove the product from the power port, check the heat level, and then plug it back into the power port. Only after the leakage protection device 400 is powered on again can it be successfully reset, allowing the switch module 403 to reconnect the power between the input terminal LINE and the output terminal LOAD.

[0086] The following is for reference. Figure 4 and Figure 5D .and Figure 5B compared to, Figure 5DThe schematic diagram also includes an over-temperature self-test module 408, which is coupled to the over-temperature protection module 405 and the drive module 406. The over-temperature self-test module 408 includes a transistor Q7 (third comparator unit), diodes D5 (third isolation element) and D8 (fourth isolation element), and series-connected voltage divider resistors R26 and R30. The anodes of diodes D5 and D8 are both connected to the base of transistor Q7, and their cathodes are connected to thermistors T1 and T2, as well as the anodes of diodes D6 and D7. Resistors R26 and R30, after voltage division, provide the emitter voltage for transistor Q7. When thermistors T1 and / or T2 experience an open-circuit fault, the base of transistor Q7 is grounded through diodes D5 and / or D8 and resistors R28 and / or R29. This grounding voltage is lower than the emitter voltage of transistor Q7 (i.e., the reference voltage provided by the voltage divider through resistors R26 and R30). Current flows through R26-Q7-D5 / D8-R28 / R29, triggering transistor Q7 to conduct. Simultaneously, current (over-temperature self-check fault signal) flows through R26-Q7, triggering the thyristor Q5 to conduct. Most of the current flows to ground through HOT-R2-C6-DB1-LED3-R25-Q5. LED3 is illuminated, indicating to the user that the product temperature is too high. At the same time, since most of the current no longer flows through the coil RELAY, the magnetic field weakens, making it impossible to maintain the closed state of switch module 403. Switch module 403 disconnects the power connection between the input terminal LINE and the output terminal LOAD, thus achieving the over-temperature self-check function.

[0087] The following is for reference. Figure 4 and Figure 5E .and Figure 5D compared to, Figure 5EThe over-temperature self-test module 408 also includes a resistor R31 and a Zener diode ZD2 (first voltage regulator component) connected in series, and a resistor R32 and a Zener diode ZD3 (second voltage regulator component) connected in series. Resistor R31 is connected to thermistor T1, and resistor R32 is connected to thermistor T2. Since Zener diodes ZD2 and ZD3 have higher impedance at lower currents and lower impedance at higher currents, when thermistors T1 and / or T2 detect a low temperature (e.g., -35°C), Zener diodes ZD2 and / or ZD3 ensure a high voltage across resistor R31. Setting the emitter voltage of transistor Q7 to a higher voltage keeps transistor Q7 off. When thermistors T1 and / or T2 experience an open-circuit fault, the base of transistor Q7 is grounded through diodes D5 and / or D8 and resistors R28 and / or R29. This grounding voltage is lower than the emitter voltage of transistor Q7 (i.e., the reference voltage provided by the voltage divider through resistors R26 and R30). Current flows through R26-Q7-D5 / D8-R28 / R29, triggering transistor Q7 to conduct. Simultaneously, current (over-temperature self-check fault signal) flows through R26-Q7, triggering the thyristor Q5 to conduct. Most of the current flows to ground through HOT-R2-C6-DB1-LED3-R25-Q5. LED3 is illuminated, indicating to the user that the product temperature is too high. At the same time, since most of the current no longer flows through the coil RELAY, the magnetic field weakens, making it impossible to maintain the closed state of switch module 403. Switch module 403 disconnects the power connection between the input terminal LINE and the output terminal LOAD, thus achieving the over-temperature self-check function. In other words, the first and second voltage regulator components can set the upper voltage of resistors R31 and / or R32 at a higher level, so that transistor Q7 can reliably conduct when an open circuit fault occurs in T1 and / or T2, thereby improving the self-test accuracy and reliability of the over-temperature self-test module 408.

[0088] The following is for reference. Figure 4 and Figure 5F Compared to 5B, Figure 5F The emitter and base of transistor Q6, the thermistors T1 / T2 and resistors R28 / R29, and the orientation of diodes D6 / D7 were swapped.

[0089] At normal temperatures, thermistors T1 and T2 have relatively high resistances, resulting in a higher voltage across resistors R28 and R29, which is higher than the emitter voltage of transistor Q6 (i.e., the voltage provided by the voltage divider through resistors R14 and R24), causing transistor Q6 to turn off. When the temperature detected by thermistors T1 and / or T2 rises, their resistance decreases accordingly, and the voltage across resistors R28 and / or R29 drops.

[0090] When the temperature detected by thermistors T1 and / or T2 exceeds a preset threshold, the voltage across resistors R28 and / or R29 (i.e., the over-temperature detection signal) falls below the emitter voltage of transistor Q6. Transistor Q6 then conducts, generating an over-temperature fault signal and triggering the thyristor Q5 to turn on. Most of the current flows to ground via HOT-R2-C6-DB1-LED3-R25-Q5. LED3 illuminates, indicating to the user that the product temperature is too high. Simultaneously, since most of the current no longer flows through the coil RELAY, the magnetic field weakens, making it impossible to maintain the closed state of switch module 403. Switch module 403 then disconnects the power connection between the input terminal LINE and the output terminal LOAD.

[0091] Figure 6 A schematic diagram of a leakage current protection device according to an embodiment of the present invention is shown.

[0092] refer to Figure 6 and Figure 5A The leakage current protection device 500 is coupled between the input terminal LINE and the load device LOAD, and includes a switch module 503, a leakage current detection module 504, and a drive module 506. The leakage current protection device 500 also includes... Figure 5A The over-temperature protection module 405 is located in the middle. The input terminal LINE is connected to the first plug piece and the second plug piece ( Figure 6 (Not shown in the image). The leakage detection module 504 includes a leakage detection ring ZCT1, a leakage detection chip U1, and its peripheral circuitry. The first current-carrying line HOT 51 and the second current-carrying line WHITE 52 pass through the leakage detection ring ZCT1. The switching module 503 includes a reset switch RESET for controlling the power connection between the first current-carrying line 51 and the second current-carrying line 52. Thermistor T1 in the over-temperature protection module 405 is also located near the first connector and is used to detect the temperature near the first connector. Thermistor T2 is also located near the second connector and is used to detect the temperature near the second connector. Pin 3 of the leakage detection chip U1 is connected to the end N1 where thermistors T1 and T2 are connected to provide power to them. Pin 4 of the leakage detection chip U1 is connected to the base of transistor Q6 to provide a reference voltage. The drive module 506 includes a switch drive element (such as a coil RELAY) and a silicon controlled rectifier Q1 (the first semiconductor element).

[0093] Under normal circumstances, current flows to ground through HOT-C7-DB-RELAY-U1, energizing the coil RELAY and the leakage current detection chip U1. The power supply pin (pin 3) of the leakage current detection chip U1 generates a stable voltage. The coil RELAY generates a magnetic field. When the RESET switch module 503 is manually pressed and remains closed, the power connection between the input terminal LINE and the output terminal LOAD is established.

[0094] When leakage current exists on the first current-carrying line 51 or the second current-carrying line 52, the leakage current detection ring ZCT1 detects the leakage current signal and generates a corresponding induction signal at the secondary end. The leakage current detection ring ZCT1 is coupled to the leakage current detection chip U1 and transmits the induction signal to the leakage current detection chip U1 for processing. When the value of the processed leakage current is greater than the set threshold, pin 1 of the leakage current detection chip U1 outputs a high level (leakage fault signal), and vice versa. The high level of pin 1 of the leakage current detection chip U1 is provided to the control electrode of the thyristor Q1 through resistor R4, triggering the thyristor Q to conduct. At this time, the current flows to ground through HOT-C7-DB-Q1 and no longer flows through the coil RELAY, causing the coil RELAY to be de-energized, the magnetic field to disappear, and the switch module 503 to disconnect the power connection between the input terminal LINE and the output terminal LOAD. The reset switch RESET is a mechanical switch, and the user can reset the circuit by operating the reset switch RESET.

[0095] The leakage current protection device 400 also has an over-temperature protection function. Under normal temperature, the resistance of thermistors T1 and T2 is relatively high, therefore the voltage across resistors R28 and R29 is low, lower than the base voltage of transistor Q6 (i.e., the reference voltage provided by pin 4 of the leakage current detection chip U1), and transistor Q6 is cut off. When the temperature detected by thermistors T1 and / or T2 rises, their resistance decreases accordingly, and the voltage across resistors R28 and / or R29 rises. When the temperature detected by thermistors T1 and / or T2 exceeds a preset threshold, the voltage across resistors R28 and / or R29 (i.e., the over-temperature detection signal) exceeds the base voltage of transistor Q6, and transistor Q6 conducts. Current flows through thermistors T1 / T2, diodes D6 / D7, and then through transistor Q6, generating an over-temperature fault signal. LED3 is illuminated, indicating to the user that the product temperature is too high.

[0096] Similar to the residual current device 400, in other embodiments, the residual current device 500 may include, for example, Figure 5B The over-temperature protection module 405 and part of the drive module 406 shown in the figure; or as shown in the figure. Figure 5C The over-temperature protection module 405 and part of the drive module 406 shown in the figure; or as shown in the figure. Figure 5D The over-temperature protection module 405, the partial drive module 406, and the over-temperature self-test module 408 shown in the figure; or as shown in the figure. Figure 5E The over-temperature protection module 405, the partial drive module 406, and the over-temperature self-test module 408 shown in the figure; or as shown in the figure. Figure 5F The over-temperature protection module 405 and part of the drive module 406 are shown in the diagram. Their over-temperature protection function, drive function, and over-temperature self-test function (if any) can be referred to the description above, and will not be repeated here.

[0097] The present invention also proposes an electrical connection device, comprising: a housing; and a leakage current protection device according to any of the above embodiments, the leakage current protection device being housed in the housing.

[0098] In addition, this utility model also proposes an electrical appliance, including: a load device; and an electrical connection device coupled to the load device for supplying power to the load device, wherein the electrical connection device includes a leakage protection device of any one of the above embodiments.

[0099] Therefore, although the present invention has been described with reference to specific examples, which are intended to be exemplary only and not to limit the present invention, it will be apparent to those skilled in the art that changes, additions or deletions may be made to the disclosed embodiments without departing from the spirit and scope of the present invention.

Claims

1. An electric leakage protection device, characterized by, The leakage protection device includes: A switching module coupled between the input and output terminals of a current-carrying line and configured to control the electrical connection between the input and output terminals, wherein the input terminal of the current-carrying line is connected to a first plug and a second plug. A leakage current detection module is configured to detect leakage current signals on the current-carrying line and generate a leakage fault signal when the leakage current signal is detected or when the leakage current signal exceeds a preset threshold. Over-temperature protection module, which includes: A first temperature sensor and a second temperature sensor, wherein the first temperature sensor is positioned near the first plug prong and configured to detect the temperature near the first plug prong, and the second temperature sensor is positioned near the second plug prong and configured to detect the temperature near the second plug prong; The first voltage divider element is connected in series with the first temperature sensor; The second voltage divider element is connected in series with the second temperature sensor; A first comparison unit is coupled to the first voltage divider element and the second voltage divider element, wherein... When the temperature detected by the first temperature sensor and / or the second temperature sensor exceeds the preset threshold, the first voltage divider element and / or the second voltage divider element provide an over-temperature detection signal to the first comparison unit, thereby causing the first comparison unit to generate an over-temperature fault signal; and A drive module, coupled to the switch module and the leakage current detection module, is configured to receive the leakage current fault signal and, in response to the leakage current fault signal, drive the switch module to disconnect the power connection.

2. The ground fault protection device of claim 1, wherein The over-temperature protection module also includes: A first isolation element is coupled between the first temperature sensor and the first comparison unit; and A second isolation element is coupled between the second temperature sensor and the first comparison unit, wherein... The first isolation element and the second isolation element are configured to isolate the temperature detection signals of the first temperature sensor and the second temperature sensor.

3. The ground fault protection device of claim 2, wherein, The first isolation element and the second isolation element are diodes, respectively.

4. The leakage current protection device according to claim 1, characterized in that, The leakage current detection module includes a leakage current detection chip, which is coupled to the first comparison unit to provide a reference voltage to the first comparison unit; or The over-temperature protection module further includes a third voltage divider element and a fourth voltage divider element connected in series. The third voltage divider element and the fourth voltage divider element are coupled to the first comparison unit and configured to provide a reference voltage to the first comparison unit.

5. The arc fault circuit interrupter of any of claims 1-4, wherein, The drive module is also coupled to the over-temperature protection module and is configured to receive the over-temperature fault signal and, in response to the over-temperature fault signal, drive the switch module to disconnect the power connection.

6. The ground fault protection device of claim 5, wherein, The driver module also includes: At least one first semiconductor element coupled to the leakage current detection module and configured to receive the leakage current fault signal and change a switching state in response to the leakage current fault signal; and At least one second semiconductor element is coupled to the over-temperature protection module and configured to receive the over-temperature fault signal and change the switching state in response to the over-temperature fault signal.

7. The ground fault protection device of claim 5, wherein, The driver module also includes: A reset switch is operable to: reconnect the power connection when the drive module disconnects the power connection in response to the leakage fault signal, and maintain the disconnected state of the power connection when the drive module disconnects the power connection in response to the over-temperature fault signal.

8. The ground fault protection device of any one of claims 1-4, wherein, The leakage protection device also includes: An over-temperature self-test module, coupled to the over-temperature protection module and the drive module, is configured to detect whether the over-temperature protection module has malfunctioned, and to generate an over-temperature self-test fault signal when the over-temperature protection module malfunctions. The drive module is also configured to receive the over-temperature self-test fault signal and, in response to the over-temperature self-test fault signal, drive the switch module to disconnect the power connection.

9. The ground fault protection device of claim 8, wherein, The over-temperature self-test module includes a third comparison unit coupled to the first temperature sensor and the second temperature sensor, and is configured to be triggered to generate the over-temperature self-test fault signal when the first temperature sensor and the second temperature sensor fail.

10. The ground fault protection device of claim 9, wherein, The over-temperature self-test module also includes: A first voltage regulator component is coupled to the first temperature sensor and the third comparison unit; The second voltage regulator component is coupled to the second temperature sensor and the third comparator unit, wherein... The first voltage regulator and the second voltage regulator are configured to increase the trigger voltage of the third comparator.

11. The leakage protection device according to claim 9 or 10, characterized in that The over-temperature self-test module also includes: A third isolation element is coupled between the first temperature sensor and the third comparison unit; and A fourth isolation element is coupled between the second temperature sensor and the third comparison unit, wherein, The third isolation element and the fourth isolation element are configured to isolate the temperature detection signals of the first temperature sensor and the second temperature sensor.

12. A leakage current protection device, characterized in that, The leakage protection device includes: A switching module coupled between the input and output terminals of a current-carrying line and configured to control the electrical connection between the input and output terminals, wherein the input terminal of the current-carrying line is connected to a first plug and a second plug. A leakage current detection module is configured to detect leakage current signals on the current-carrying line and generate a leakage fault signal when the leakage current signal is detected or when the leakage current signal exceeds a preset threshold. Over-temperature protection module, which includes: A first temperature sensor and a second temperature sensor, wherein the first temperature sensor is positioned near the first plug prong and configured to detect the temperature near the first plug prong, and the second temperature sensor is positioned near the second plug prong and configured to detect the temperature near the second plug prong; The first voltage divider element is connected in series with the first temperature sensor; The second voltage divider element is connected in series with the second temperature sensor; A first comparison unit is coupled to the first voltage divider element; The second comparator unit is coupled to the second voltage divider element, wherein... When the temperature detected by the first temperature sensor exceeds the preset threshold, the first voltage divider element provides an over-temperature detection signal to the first comparison unit, thereby causing the first comparison unit to generate an over-temperature fault signal; and / or When the temperature detected by the second temperature sensor exceeds the preset threshold, the second voltage divider element provides the over-temperature detection signal to the second comparison unit, thereby causing the second comparison unit to generate an over-temperature fault signal; A drive module, coupled to the switch module and the leakage current detection module, is configured to receive the leakage current fault signal and, in response to the leakage current fault signal, drive the switch module to disconnect the power connection.

13. The ground fault protection device of claim 12, wherein, The drive module is also coupled to the over-temperature protection module and is configured to receive the over-temperature fault signal and, in response to the over-temperature fault signal, drive the switch module to disconnect the power connection.

14. The ground fault protection device of claim 13, wherein, The driver module also includes: At least one first semiconductor element coupled to the leakage current detection module and configured to receive the leakage current fault signal and change a switching state in response to the leakage current fault signal; and At least one second semiconductor element is coupled to the over-temperature protection module and configured to receive the over-temperature fault signal and change the switching state in response to the over-temperature fault signal.

15. The ground fault protection device of claim 13, wherein, The driver module also includes: A reset switch is operable to: reconnect the power connection when the drive module disconnects the power connection in response to the leakage fault signal, and maintain the disconnected state of the power connection when the drive module disconnects the power connection in response to the over-temperature fault signal.

16. The leakage current protection device according to claim 12, characterized in that, The leakage protection device also includes: An over-temperature self-test module, coupled to the over-temperature protection module and the drive module, is configured to detect whether the over-temperature protection module has malfunctioned, and to generate an over-temperature self-test fault signal when the over-temperature protection module malfunctions. The drive module is also configured to receive the over-temperature self-test fault signal and, in response to the over-temperature self-test fault signal, drive the switch module to disconnect the power connection.

17. The ground fault protection device of claim 16, wherein, The over-temperature self-test module includes a third comparison unit coupled to the first temperature sensor and the second temperature sensor, and is configured to be triggered to generate the over-temperature self-test fault signal when the first temperature sensor and the second temperature sensor fail.

18. The ground fault protection device of claim 17, wherein, The over-temperature self-test module also includes: A first voltage regulator component is coupled to the first temperature sensor and the third comparison unit; The second voltage regulator component is coupled to the second temperature sensor and the third comparator unit, wherein... The first voltage regulator and the second voltage regulator are configured to increase the trigger voltage of the third comparator.

19. The leakage protection device according to claim 17 or 18, characterized in that The over-temperature self-test module also includes: A third isolation element is coupled between the first temperature sensor and the third comparison unit; and A fourth isolation element is coupled between the second temperature sensor and the third comparison unit, wherein, The third isolation element and the fourth isolation element are configured to isolate the temperature detection signals of the first temperature sensor and the second temperature sensor.

20. The ground fault protection device of claim 12, wherein, The leakage protection device also includes: A leakage current self-test module, coupled to the leakage current detection module and the drive module, is configured to periodically generate a simulated leakage current signal to detect whether the leakage current detection module has malfunctioned, and to generate a leakage current self-test fault signal when the leakage current detection module malfunctions. The drive module is also configured to receive the leakage current self-test fault signal and, in response to the leakage current self-test fault signal, drive the switch module to disconnect the power connection.

21. A leakage current protection device, characterized in that, The leakage protection device includes: A switching module coupled between the input and output terminals of a current-carrying line and configured to control the electrical connection between the input and output terminals; A leakage current detection module is configured to detect leakage current signals on the current-carrying line and generate a leakage fault signal when the leakage current signal is detected or when the leakage current signal exceeds a preset threshold. An over-temperature protection module is configured to detect the temperature of a specific component and / or a specific location, and generate an over-temperature fault signal when the temperature of the specific component and / or the specific location exceeds a preset threshold; and A drive module coupled to the switch module, the drive module comprising: At least one first semiconductor element coupled to the leakage current detection module and configured to receive the leakage current fault signal and, in response to the leakage current fault signal, change a switching state, thereby driving the switching module to disconnect the power connection; and At least one second semiconductor element is coupled to the over-temperature protection module and configured to receive the over-temperature fault signal and change the switching state in response to the over-temperature fault signal, thereby driving the switching module to disconnect the power connection.

22. The ground fault protection device of claim 21, wherein, The driver module also includes: A reset switch is operable to: reconnect the power connection when at least one first semiconductor element drives the switch module to disconnect the power connection in response to the leakage fault signal, and maintain the disconnected state of the power connection when at least one second semiconductor element drives the switch module to disconnect the power connection in response to the over-temperature fault signal.

23. The arc fault circuit interrupter of Claim 21 or 22, wherein, The leakage protection device also includes: An over-temperature self-test module, coupled to the over-temperature protection module and the drive module, is configured to detect whether the over-temperature protection module has malfunctioned, and to generate an over-temperature self-test fault signal when the over-temperature protection module malfunctions. The at least one second semiconductor element is also configured to receive the over-temperature self-test fault signal and, in response to the over-temperature self-test fault signal, change the switching state, thereby driving the switching module to disconnect the power connection.

24. The ground fault protection device of claim 23, wherein, The over-temperature protection module includes at least one temperature sensor, and the over-temperature self-test module includes a third comparison unit coupled to the at least one temperature sensor and configured to be triggered to generate the over-temperature self-test fault signal when the at least one temperature sensor fails.

25. The leakage current protection device according to claim 24, characterized in that, The over-temperature self-test module further includes at least one voltage regulator component coupled to the at least one temperature sensor and the third comparison unit, wherein the at least one voltage regulator component is configured to increase the trigger voltage of the third comparison unit.

26. An arc fault circuit interrupter comprising: The leakage protection device includes: A switching module coupled between the input and output terminals of a current-carrying line and configured to control the electrical connection between the input and output terminals; A leakage current detection module is configured to detect leakage current signals on the current-carrying line and generate a leakage fault signal when the leakage current signal is detected or when the leakage current signal exceeds a preset threshold. An over-temperature protection module is configured to detect the temperature of a specific component and / or a specific location, and generate an over-temperature fault signal when the temperature of the specific component and / or the specific location exceeds a preset threshold. An over-temperature self-test module, coupled to the over-temperature protection module, is configured to detect whether the over-temperature protection module has malfunctioned, and to generate an over-temperature self-test fault signal when the over-temperature protection module malfunctions; and A drive module, coupled to the switch module, the leakage current detection module, the over-temperature protection module, and the over-temperature self-test module, is configured to receive the leakage current fault signal, the over-temperature fault signal, and the over-temperature self-test fault signal, and drive the switch module to disconnect the power connection in response to one or more of the leakage current fault signal, the over-temperature fault signal, and the over-temperature self-test fault signal.

27. The ground fault protection device of claim 26, wherein, The over-temperature protection module includes at least one temperature sensor, and the over-temperature self-test module includes a third comparison unit coupled to the at least one temperature sensor and configured to be triggered to generate the over-temperature self-test fault signal when the at least one temperature sensor fails.

28. The ground fault protection device of claim 27, wherein, The over-temperature self-test module further includes at least one voltage regulator component coupled to the at least one temperature sensor and the third comparison unit, wherein the at least one voltage regulator component is configured to increase the trigger voltage of the third comparison unit.

29. An electrical connection device, characterized by The electrical connection device includes: Casing; and The leakage current protection device according to any one of claims 1-28, wherein the leakage current protection device is housed in the housing.

30. An electrical appliance, characterized by The electrical appliances include: Load devices; and The electrical connection device according to claim 29 is coupled to the load device for supplying power to the load device.

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