Detection and protection apparatus for power line, and electrical connection device and electric device

Abstract

Disclosed in the present application are a detection and protection apparatus for a power line, and an electrical connection device and an electric device. A first shielding conductor structure (110) and a second shielding conductor structure (120) are provided in a power line (100). When an open circuit occurs in the first shielding conductor structure (110) and / or the second shielding conductor structure (120), a first impedance element (310) can generate a first open-circuit signal, and a second impedance element (320) can generate a second open-circuit signal. When detecting the first open-circuit signal, the second open-circuit signal or an electric leakage signal, a switch tripping driving unit (330) can control a switch module (200) to disconnect an electrical connection between an input end of the power line (100) and an output end thereof.

Description

Power line detection and protection device, electrical connection equipment and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the application number "202311122754.X" filed on August 31, 2023, and the application name "Power cord, detection and protection device, electrical connection equipment and electrical equipment", the application number "202322372544.8" filed on August 31, 2023, and the application name "Power cord, detection and protection device, electrical connection equipment and electrical equipment", the application number "202311122770.9" filed on August 31, 2023, and the application name "Power cord detection and protection device, electrical connection equipment and electrical equipment", and the application number "202311122770.9" filed on August 31, 2023 The application claims priority to the Chinese patent application No. "202322372570.0" and application name "Detection and protection device, electrical connection equipment and electrical equipment for power lines", the application No. "202311621625.5" filed on November 29, 2023 and application name "Detection and protection device, electrical connection equipment and electrical equipment for power lines", and the application No. "202323248831.4" filed on November 29, 2023 and application name "Detection and protection device, electrical connection equipment and electrical equipment for power lines". The entire contents of the above patent applications are incorporated into this application by reference. Technical Field

[0003] The present application relates to the technical field of electronic circuits, and in particular to a detection and protection device for a power line, an electrical connection device, and an electrical device. Background Art

[0004] A leakage circuit detector interrupter (LCDI) is a power connection device for electrical appliances. It can detect leakage current in the power cord group through a leakage current detection line and cut off the power connection of the appliance when a certain leakage current is detected, ensuring safe use.

[0005] In existing leakage current detection circuit breakers, when the leakage current detection line of the live wire or neutral wire in the power cord is broken, the appliance can still output power. At this time, the appliance may pose a safety hazard to electricity use. However, the leakage current detection circuit breaker of the related technology cannot reflect the integrity of the leakage current detection line.

[0006] Summary of the Invention

[0007] Embodiments of the present application provide a power line detection and protection device, an electrical connection device, and an electrical device.

[0008] In a first aspect, an embodiment of the present application provides a detection and protection device for a power line, wherein the power line includes a first current-carrying line and a second current-carrying line, the power line further including a first shielding conductor structure covering the first current-carrying line and a second shielding conductor structure covering the second current-carrying line, the first shielding conductor structure including a first end near the input end of the power line, a second end near the output end of the power line, and a third end located between the first end and the second end, the second shielding conductor structure including a fourth end near the input end of the power line, a fifth end near the output end of the power line, and a sixth end located between the fourth end and the fifth end; the third end and the sixth end are connected;

[0009] The detection and protection device comprises:

[0010] a switch module, configured to control the power connection between the input end and the output end of the power line;

[0011] A driving module, comprising a switch tripping driving unit, a first impedance element and a second impedance element; the first impedance element is connected between the first end and the fourth end, and the second impedance element is connected between the second end and the fifth end;

[0012] The first impedance element is configured to generate a first open circuit signal when the first shielded conductor structure and / or the second shielded conductor structure is open circuited; the second impedance element is configured to generate a second open circuit signal when the first shielded conductor structure and / or the second shielded conductor structure is open circuited;

[0013] The trip switch drive unit is configured to control the switch module to disconnect the power connection between the input end and the output end of the power line when receiving the first open circuit signal or the second open circuit signal, or detecting a leakage signal of the first shielded conductor structure or the second shielded conductor structure.

[0014] In some embodiments, the first impedance element is further configured to generate the first open circuit signal when an open circuit occurs at at least one of the following locations:

[0015] a first shielding conductor structure between the first end and the third end;

[0016] a second shielding conductor structure between the fourth end and the sixth end;

[0017] a connection between the third end and the sixth end;

[0018] The second impedance element is further configured to generate the second open circuit signal when an open circuit occurs at at least one of the following locations:

[0019] a first shielding conductor structure between the second end and the third end;

[0020] a second shielding conductor structure between the fifth end and the sixth end;

[0021] A connection between the third end and the sixth end.

[0022] In some embodiments, the driving module further includes a third impedance element, a fourth impedance element, a fifth impedance element, and a sixth impedance element; the third impedance element, the first impedance element, and the fifth impedance element are sequentially connected in series to form a first series branch, and the fourth impedance element, the second impedance element, and the sixth impedance element are sequentially connected in series to form a second series branch;

[0023] The first series branch and the second series branch are both connected between the first current-carrying line and the second current-carrying line, the connection point of the first impedance element and the third impedance element is connected to the first end, the connection point of the first impedance element and the fifth impedance element is connected to the fourth end, the connection point of the second impedance element and the fourth impedance element is connected to the second end, and the connection point of the second impedance element and the sixth impedance element is connected to the fifth end.

[0024] In some embodiments, the driving module further includes a seventh impedance element, and the fifth impedance element and the sixth impedance element are both connected to the second current-carrying line through the seventh impedance element.

[0025] In some embodiments, the switch tripping drive unit includes a switch unit and a coil for generating an electromagnetic force to drive the switch module. The second current-carrying line, the coil, the switch unit and the first current-carrying line are connected in sequence so that when the switch unit is turned on, the electromagnetic force of the coil is used to control the switch module to disconnect the power connection between the input end and the output end of the power line.

[0026] In some embodiments, the fifth impedance element and the sixth impedance element are both connected to the second current-carrying line through the seventh impedance element and the coil.

[0027] In some embodiments, the switching unit includes a first switching tube and a second switching tube, the connection point of the first impedance element and the fifth impedance element is connected to the control pin of the first switching tube, and the connection point of the second impedance element and the sixth impedance element is connected to the control pin of the second switching tube.

[0028] In some embodiments, the switch tripping drive unit further includes a first diode and a second diode; the anode of the first diode, the anode of the second diode, a switch pin of the first switch tube, and a switch pin of the second switch tube are all connected to the connection point of the third impedance element and the fourth impedance element; the cathode of the first diode is connected to the first current-carrying line; the cathode of the second diode, another switch pin of the first switch tube, and another switch pin of the second switch tube are all connected to one end of the coil, and the other end of the coil is connected to the second current-carrying line.

[0029] In some embodiments, a first capacitor and a second capacitor are further included, one end of the first capacitor is connected to the control pin of the first switching tube, and the other end is connected to the connection point of the third impedance element and the fourth impedance element, one end of the second capacitor is connected to the control pin of the second switching tube, and the other end is connected to the connection point of the third impedance element and the fourth impedance element.

[0030] In some embodiments, the detection and protection device further includes a test module, and the test module is configured to short-circuit the fifth impedance element, the sixth impedance element, or the seventh impedance element after being triggered.

[0031] In some embodiments, the test module includes a test switch, and the test switch is connected in parallel with the fifth impedance element, the sixth impedance element, or the seventh impedance element;

[0032] Alternatively, one end of the test switch is connected to a connection point between the fifth impedance element and the sixth impedance element, and the other end is connected to a connection point between the seventh impedance element and the coil.

[0033] In some embodiments, a lightning protection module is further included, one end of which is connected to the first current-carrying line, and the other end of which is respectively connected to the second current-carrying line and one end of the coil.

[0034] In some embodiments, an LED indication unit is further included in parallel with the switch unit, and the LED indication unit includes an eighth impedance element and a light emitting diode connected in series.

[0035] In a second aspect, an embodiment of the present application provides an electrical connection device, comprising a housing, a power cord, and the detection and protection device described in the first aspect, wherein the power cord is connected to the detection and protection device, and the detection and protection device is arranged inside the housing.

[0036] In a third aspect, an embodiment of the present application provides an electrical device, comprising a load device and the electrical connection device described in the second aspect, wherein the output end of the power line is connected to the load device.

[0037] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG1 is a schematic diagram of module connections of a detection and protection device provided in an embodiment of the present application;

[0039] FIG2 is a circuit diagram of a detection and protection device provided in an embodiment of the present application;

[0040] FIG3 is a schematic diagram of current flow of the detection and protection device provided in an embodiment of the present application under normal working conditions;

[0041] 4 and 5 are schematic diagrams of current flow when leakage current occurs in the first shielding conductor structure and / or the second shielding conductor structure according to an embodiment of the present application;

[0042] 6 is a schematic diagram of current flow when an open circuit occurs in the first shielding conductor structure from the first end to the third end provided by an embodiment of the present application;

[0043] 7 is a schematic diagram of current flow when an open circuit occurs in the first shielding conductor structure from the third end to the second end provided by an embodiment of the present application;

[0044] 8 is a schematic diagram of current flow when an open circuit occurs in the second shielding conductor structure from the fourth end to the sixth end provided by an embodiment of the present application;

[0045] 9 is a schematic diagram of current flow when an open circuit occurs in the second shielding conductor structure from the sixth end to the fifth end provided by an embodiment of the present application;

[0046] FIG10 is a schematic diagram showing an open circuit in the connection from the third terminal to the sixth terminal provided by an embodiment of the present application;

[0047] FIG11 is a schematic diagram of current flow after the test switch is closed according to an embodiment of the present application; and

[0048] FIG12 is a schematic diagram of an electrical connection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementation methods. At the same time, the steps or actions in the method description can also be swapped or adjusted in order in a manner that is obvious to those skilled in the art. Therefore, the various orders in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary order, unless otherwise specified that a certain order must be followed.

[0050] In the description of this application, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0051] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0052] A leakage current detection circuit breaker, or LCDI, uses a shielded wire wrapped around the live or neutral wire to detect leakage current on the live or neutral wire. If the live or neutral wire is damaged and leakage current is transmitted to the shielded wire, the leakage current detection circuit breaker will trigger a power disconnection. Current LCDIs are designed specifically for leakage current detection. By connecting the corresponding circuit to the shield layer, they can detect leakage signals from the shield layer, triggering the power disconnection of the power line. However, if the shielded wire is open, the leakage current cannot be detected, so the power line will not be disconnected, and no fault indication will be displayed, posing a potential safety hazard to electrical appliances.

[0053] Based on this, an embodiment of the present application provides a detection and protection device for a power line, an electrical connection device, and an electrical device. The power line is wrapped with a first current-carrying wire through a first shielded conductor structure and includes a second current-carrying wire through a second shielded conductor structure. The first shielded conductor structure is divided into a first end, a second end, and a third end. The second shielded conductor structure is divided into a fourth end, a fifth end, and a sixth end. The third end and the sixth end are connected. The first end, the second end, the fourth end, and the fifth end are used to connect to the detection and protection device. A first impedance element and a second impedance element are configured in a driving module of the detection and protection device, respectively, for detecting the open circuit of the first shielded conductor structure and / or the second shielded conductor structure. When an open circuit occurs, a first open circuit signal and a second open circuit signal are generated. The trip switch driving unit in the detection and protection device receives the first open circuit signal and the second open circuit signal, respectively, and can control the switch module to disconnect the power connection between the input end and the output end of the power line. The above-mentioned detection and protection device can detect the integrity of the shielding layer of the power line, disconnect the power connection of the power line when an open circuit occurs in the shielding layer, and ensure power safety.

[0054] The following describes the power line detection and protection device, electrical connection equipment and electrical equipment with reference to the accompanying drawings.

[0055] As shown in FIG1 , the power line 100 includes a first current-carrying line and a second current-carrying line. The power line 100 also includes a first shielded conductor structure 110 covering the first current-carrying line and a second shielded conductor structure 120 covering the second current-carrying line. The first shielded conductor structure 110 includes a first end a near the input end of the power line 100, a second end b near the output end of the power line 100, and a third end c located between the first end a and the second end b. The second shielded conductor structure 120 includes a fourth end d near the input end of the power line 100, a fifth end e near the output end of the power line 100, and a sixth end f located between the fourth end d and the fifth end e. The third end c and the sixth end f are connected.

[0056] The detection and protection device 300 includes:

[0057] The switch module 200 is used to control the power connection between the input end and the output end of the power line 100;

[0058] A driving module includes a switch tripping driving unit 330, a first impedance element 310, and a second impedance element 320; the first impedance element 310 is connected between the first end a and the fourth end d, and the second impedance element 320 is connected between the second end b and the fifth end e;

[0059] The first impedance element 310 is configured to generate a first open circuit signal when the first shielding conductor structure 110 and / or the second shielding conductor structure 120 is open circuited; the second impedance element 320 is configured to generate a second open circuit signal when the first shielding conductor structure 110 and / or the second shielding conductor structure 120 is open circuited;

[0060] The trip switch driving unit 330 is configured to control the switch module 200 to disconnect the power connection between the input end and the output end of the power line 100 when receiving the first open circuit signal or the second open circuit signal, or detecting the leakage signal of the first shielded conductor structure 110 or the second shielded conductor structure 120.

[0061] A power line 100 is connected between the electrical connection device and the load device. The power line 100 includes a first current-carrying line and a second current-carrying line. The first current-carrying line is wrapped by a first shielded conductor structure 110, and the second current-carrying line is wrapped by a second shielded conductor structure 120. An insulation layer of the first current-carrying line is provided between the first current-carrying line and the first shielded conductor structure 110, and an insulation layer of the second current-carrying line is provided between the second current-carrying line and the second shielded conductor structure 120. In the case where leakage current occurs, after the insulation layer on the surface of the first current-carrying line is damaged, when the first current-carrying line contacts the first shielded conductor structure 110, causing leakage current in the first shielded conductor structure 110, the leakage signal of the leakage current can be detected by the switch tripping drive unit 330, thereby triggering the disconnection of the switch module 200. Similarly, after the insulation layer on the surface of the second current-carrying line is damaged, when the second current-carrying line contacts the second shielded conductor structure 120, causing leakage current in the second shielded conductor structure 120, the leakage signal of the leakage current can be detected by the switch tripping drive unit 330, thereby triggering the disconnection of the switch module. 200; The situation where an open circuit occurs is that an open circuit occurs on the first shielding conductor structure 110, and the first impedance element 310 and the second impedance element 320 can both generate corresponding open circuit signals, so that the switch tripping drive unit 330 detects the first open circuit signal and the second open circuit signal, thereby triggering the disconnection of the switch module 200. Similarly, when an open circuit occurs on the second shielding conductor structure 120, the first impedance element 310 and the second impedance element 320 can both generate corresponding open circuit signals, so that the switch tripping drive unit 330 detects the first open circuit signal and the second open circuit signal, thereby triggering the disconnection of the switch module 200.

[0062] On the power line 100, the first end a of the first shielded conductor structure 110 can be connected to the first impedance element 320 of the detection and protection device 300 via a first conductive line 410, and the second end b can be connected to the second impedance element 330 of the detection and protection device 300 via a first return line 510. The fourth end d of the second shielded conductor structure 120 can be connected to the first impedance element 320 of the detection and protection device 300 via a second conductive line 420, and the fifth end e can be connected to the second impedance element 330 of the detection and protection device 300 via a second return line 520. The detection and protection device 300 forms a detection path through the first impedance element 310, the second impedance element 320, the first end a, the second end b, the fourth end d, and the fifth end e, thereby detecting leakage signals and open circuit conditions of the first and second shielded conductor structures 110 and 120.

[0063] Specifically, any of the first shielded conductor structure 110 between the first end a and the third end c, the first shielded conductor structure 110 between the third end c and the second end b, the second shielded conductor structure 120 between the fourth end d and the sixth end f, the second shielded conductor structure 120 between the sixth end f and the fifth end e, and the conductor structure between the third end c and the sixth end f can be used to detect an open circuit. Therefore, the first impedance element 310 is further configured to generate a first open circuit signal when an open circuit occurs at at least one of the following locations:

[0064] a first shielding conductor structure 110 between the first end a and the third end c;

[0065] a second shielding conductor structure 120 between the fourth end d and the sixth end f;

[0066] a connection between the third terminal c and the sixth terminal f;

[0067] It can be seen that the first open circuit signal of the first impedance element 310 is generated when an open circuit occurs at any of the three corresponding positions mentioned above; in the case where an open circuit occurs at the three positions mentioned above, the switch tripping driving unit 330 triggers the control switch module 200 to disconnect the power connection between the input end and the output end of the power cord 100 through the first open circuit signal.

[0068] The second impedance element 320 is further configured to generate a second open circuit signal when an open circuit occurs at at least one of the following locations:

[0069] a first shielding conductor structure 110 between the second end b and the third end c;

[0070] a second shielding conductor structure 120 between the fifth end e and the sixth end f;

[0071] The connection between the third terminal c and the sixth terminal f.

[0072] It can be seen that the second open circuit signal of the second impedance element 320 is generated when an open circuit occurs at any of the three corresponding positions mentioned above; in the case where an open circuit occurs at the three positions mentioned above, the switch tripping driving unit 330 triggers the control switch module 200 to disconnect the power connection between the input end and the output end of the power line 100 through the second open circuit signal.

[0073] Through the first open-circuit signal and the second open-circuit signal, the detection and protection device 300 of the embodiment of the present application can detect the integrity of the first shielding conductor structure 110 and the second shielding conductor structure 120, that is, detect the integrity of the shielding layer of the power cord 100. When an open circuit occurs at any of the above-mentioned positions of the shielding layer, the detection and protection device 300 can disconnect the power connection of the power cord 100. The detection and protection device 300 can also trigger the disconnection of the power connection of the power cord 100 through the leakage signal of the shielding layer. Therefore, regardless of whether the power cord 100 has a leakage or the shielding layer is open, the detection and protection device 300 of the embodiment of the present application can cut off the power connection of the power cord 100, thereby ensuring power safety.

[0074] The specific circuit structure of the detection and protection device 300 is described below by way of example.

[0075] For ease of explanation, in this embodiment, the first impedance element 310 is represented as a first resistor R1 in FIG. 2 , and the second impedance element 320 is represented as a second resistor R2 in FIG. 2 . It is understandable that the first resistor R1 and the second resistor R2 can be single resistor elements or a resistor network composed of multiple resistors connected in series, in parallel, or in series and parallel. The first resistor R1 and the second resistor R2 can also be other voltage drop elements and combinations thereof, such as inductors, capacitors, or any combination of capacitors, inductors, and resistors.

[0076] One end of the first resistor R1 is connected to the first end a, the other end of the first resistor R1 is connected to the fourth end d, one end of the second resistor R2 is connected to the second end b, and the other end of the second resistor R2 is connected to the fifth end e; therefore, the first resistor R1 is connected to the first shielded conductor structure 110 and the second shielded conductor structure 120 through the first end a and the fourth end d, so that when the first shielded conductor structure 110 and / or the second shielded conductor structure 120 is open-circuited, the current flowing through the first resistor R1 changes, and this change corresponds to the first open-circuit signal, thereby triggering the switch tripping drive unit 330. Similarly, the second resistor R2 is connected to the first shielded conductor structure 110 and the second shielded conductor structure 120 through the second end b and the fifth end e, so that when the first shielded conductor structure 110 and / or the second shielded conductor structure 120 is open-circuited, the current flowing through the second resistor R2 changes, and this change corresponds to the second open-circuit signal, thereby triggering the switch tripping drive unit 330.

[0077] 2 , in some embodiments, the driving module further includes a third impedance element, a fourth impedance element, a fifth impedance element, and a sixth impedance element; the third impedance element, the first impedance element 310 , and the fifth impedance element are sequentially connected in series to form a first series branch, and the fourth impedance element, the second impedance element 320 , and the sixth impedance element are sequentially connected in series to form a second series branch.

[0078] The first series branch and the second series branch are both connected between the first current-carrying line and the second current-carrying line, the connection point of the first impedance element 310 and the third impedance element is connected to the first end a, the connection point of the first impedance element 310 and the fifth impedance element is connected to the fourth end d, the connection point of the second impedance element 320 and the fourth impedance element is connected to the second end b, and the connection point of the second impedance element 320 and the sixth impedance element is connected to the fifth end e.

[0079] For the convenience of explanation, in this embodiment, the third impedance element is represented as a third resistor R3 in Figure 2, the fourth impedance element is represented as a fourth resistor R4 in Figure 2, the fifth impedance element is represented as a fifth resistor R5 in Figure 2, and the sixth impedance element is represented as a sixth resistor R6 in Figure 2; it can be understood that the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 can be a single resistor element, or a resistor network composed of multiple resistors connected in series, in parallel, or in series and parallel. The third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 can also be other voltage drop elements and combinations thereof, such as inductors, capacitors, or any combination of capacitors, inductors and resistors.

[0080] One end of the third resistor R3 is connected to the first current-carrying line, and the other end of the third resistor R3 is connected to the first end a. One end of the fourth resistor R4 is connected to the first current-carrying line, and the other end of the fourth resistor R4 is connected to the second end b. Therefore, the third resistor R3 and the fourth resistor R4 are both connected to the first current-carrying line; one end of the fifth resistor R5 is connected to the second current-carrying line, and the other end of the fifth resistor R5 is connected to the fourth end d. One end of the sixth resistor R6 is connected to the second current-carrying line, and the other end of the sixth resistor R6 is connected to the fifth end e. Therefore, the fifth resistor R5 and the sixth resistor R6 are both connected to the second current-carrying line. It can be seen from this that the second current-carrying line is connected to the first current-carrying line through the fifth resistor R5, the first resistor R1 and the third resistor R3, but since the third end c and the sixth end f are both connected, when there is no open circuit between the first shielding conductor structure 110 and the second shielding conductor structure 120, the first resistor R1 is short-circuited. At this time, the current direction of the second current-carrying line through the fifth resistor R5 is: the second current-carrying line, the fifth resistor R5, the second shielding conductor structure 120, the first shielding conductor structure 110, the third resistor R3 / the fourth resistor R4, and finally to the first current-carrying line. Similarly, the second current-carrying line is connected to the first current-carrying line through the sixth resistor R6, the second resistor R2 and the fourth resistor R4. However, since the third end c and the sixth end f are connected, the second resistor R2 is short-circuited when there is no open circuit between the first shielding conductor structure 110 and the second shielding conductor structure 120. At this time, the current direction of the second current-carrying line through the sixth resistor R6 is: the second current-carrying line, the sixth resistor R6, the second shielding conductor structure 120, the first shielding conductor structure 110, the third resistor R3 / the fourth resistor R4, and finally to the first current-carrying line.

[0081] It can be seen that when the first shielding conductor structure and / or the second shielding conductor structure is open-circuited, the current in the circuit changes, so that the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 cooperate to generate an open-circuit signal, thereby realizing open-circuit detection, specifically:

[0082] When the first shielding conductor structure 110 between the first end a and the third end c is open-circuited, the second current-carrying line, the fifth resistor R5, the fourth end d, the sixth end f, the third end c, the second end b, the fourth resistor R4 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the fifth resistor R5, the first resistor R1, the third resistor R3 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the sixth resistor R6, the fifth end e, the sixth end f, the third end c, the second end b, the fourth resistor R4 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the sixth resistor R6, the fifth end e, the sixth end f, the fourth end d, the first resistor R1, the third resistor R3 and the first current-carrying line form a current path. The current in the first series branch and the second series branch changes, thereby triggering the switch tripping drive unit 330.

[0083] When the first shielding conductor structure 110 between the second end b and the third end c is open-circuited, the second current-carrying line, the fifth resistor R5, the fourth end d, the sixth end f, the third end c, the first end a, the third resistor R3 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the fifth resistor R5, the fourth end d, the sixth end f, the fifth end e, the second resistor R2, the fourth resistor R4 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the sixth resistor R6, the second resistor R2, the fourth resistor R4 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the sixth resistor R6, the fifth end e, the sixth end f, the third end c, the first end a, the third resistor R3 and the first current-carrying line form a current path. The current in the first series branch and the second series branch changes, thereby triggering the switch tripping drive unit 330.

[0084] When the second shielding conductor structure 120 between the fourth end d and the sixth end f is open-circuited, the second current-carrying line, the fifth resistor R5, the first resistor R1, the third resistor R3 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the fifth resistor R5, the fourth end d, the first resistor R1, the first end a, the third end c, the second end b, the fourth resistor R4 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the sixth resistor R6, the fifth end e, the sixth end f, the third end c, the first end a, the third resistor R3 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the sixth resistor R6, the fifth end e, the sixth end f, the third end c, the second end b, the fourth resistor R4 and the first current-carrying line form a current path. The current in the first series branch and the second series branch changes, thereby triggering the switch tripping drive unit 330.

[0085] When the second shielding conductor structure 120 between the fifth end e and the sixth end f is open-circuited, the second current-carrying line, the fifth resistor R5, the fourth end d, the sixth end f, the third end c, the first end a, the third resistor R3 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the fifth resistor R5, the fourth end d, the sixth end f, the third end c, the second end b, the fourth resistor R4 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the sixth resistor R6, the second resistor R2, the fourth resistor R4 and the first current-carrying line form a current path. At the same time, the second current-carrying line, the sixth resistor R6, the fifth end e, the second resistor R2, the second end b, the third end c, the first end a, the third resistor R3 and the first current-carrying line form a current path. The current in the first series branch and the second series branch changes, thereby triggering the switch tripping drive unit 330.

[0086] When the connection between the third terminal c and the sixth terminal f is open, the second current-carrying line, the fifth resistor R5, the first resistor R1, the third resistor R3, and the first current-carrying line form a current path. At the same time, the second current-carrying line, the sixth resistor R6, the second resistor R2, the fourth resistor R4, and the first current-carrying line form a current path. The current in the first series branch and the second series branch changes, thereby triggering the switch trip drive unit 330.

[0087] 2 , in some embodiments, the driving module further includes a seventh impedance element, and the fifth impedance element and the sixth impedance element are both connected to the second current-carrying line through the seventh impedance element.

[0088] For ease of explanation, the seventh impedance element in this embodiment is represented as the seventh resistor R7 in Figure 2; it can be understood that the seventh resistor R7 can be a single resistor element or a resistor network composed of multiple resistors connected in series, in parallel, or in series and parallel. The seventh resistor R7 can also be other voltage drop elements and combinations thereof, such as an inductor, a capacitor, or any combination of a capacitor, an inductor, and a resistor.

[0089] As shown in Figure 2, the fifth resistor R5 and the sixth resistor R6 are connected in parallel and in series with the seventh resistor R7. The seventh resistor R7 acts as a voltage divider. The first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7 form an impedance network. By adjusting the resistance values ​​of the various resistors in the impedance network, stable operation can be achieved without an open circuit in the first shielding conductor structure 110 and the second shielding conductor structure 120, preventing erroneous triggering of the trip switch drive unit 330. The seventh resistor R7 can also be used to connect to a test switch. By short-circuiting the seventh resistor R7 through the test switch, the LCDI device can be tested. This will be described in detail later.

[0090] 2 , in some embodiments, the switch tripping drive unit 330 includes a switch unit and a coil Lx for generating an electromagnetic force to drive the switch module 200. The second current-carrying line, the coil Lx, the switch unit, and the first current-carrying line are connected in sequence so that when the switch unit is turned on, the electromagnetic force of the coil Lx is used to control the switch module 200 to disconnect the power connection between the input and output ends of the power line 100.

[0091] The second current-carrying line is connected to the first current-carrying line via a coil Lx and a switch unit. When the switch unit is turned on, the switch tripping drive unit 330 uses the electromagnetic force generated by energizing the coil Lx to control the switch module 200 to disconnect, thereby disconnecting the power connection between the input and output ends of the power cord 100. The switch unit can be turned on by a first open-circuit signal, a second open-circuit signal, or a leakage signal, or indirectly, such as when the switch tripping drive unit 330 receives the first open-circuit signal, the second open-circuit signal, or the leakage signal, triggering the switch unit to turn on via a control chip, a trigger circuit, or the like. The switch unit can be a conventional contact switch or a semiconductor device such as a transistor or a MOS transistor, without limitation herein.

[0092] 2 , the fifth impedance element and the sixth impedance element are both connected to the second current-carrying line via a seventh impedance element and a coil Lx.

[0093] The coil Lx is connected between the second current-carrying line and the first current-carrying line to ensure that a sufficiently large electromagnetic force can be generated. In the circuit connection, the second current-carrying line is first connected to the above-mentioned impedance network through the coil Lx, that is, the coil Lx is first connected to the seventh resistor R7 and then to the fifth resistor R5 and the sixth resistor R6.

[0094] As shown in Figure 2, in some embodiments, the switching unit includes a first switching tube Q1 and a second switching tube Q2, the connection point of the fifth impedance element and the sixth impedance element is connected to the control pin of the first switching tube Q1, and the connection point of the seventh impedance element and the eighth impedance element is connected to the control pin of the second switching tube Q2.

[0095] This embodiment uses the voltage at the dividing point between the first resistor R1 and the fifth resistor R5, and the voltage at the dividing point between the second resistor R2 and the sixth resistor R6 to directly control the conduction of the switch unit. A first switch Q1 and a second switch Q2 are configured separately. The first switch Q1 is triggered by the voltage at the dividing point between the first resistor R1 and the fifth resistor R5, and the second switch Q2 is triggered by the voltage at the dividing point between the second resistor R2 and the sixth resistor R6. In other words, the voltage at the connection point between the fifth resistor R5 and the sixth resistor R6 is used to control the conduction and shutdown of the first switch Q1. When a first open-circuit signal or leakage signal causes the voltage at the connection point between the fifth resistor R5 and the sixth resistor R6 to increase, the first switch Q1 is turned on, thereby controlling the switch module 200 to be turned off. Similarly, the voltage at the connection point between the seventh resistor R7 and the eighth resistor R8 is used to control the conduction and shutdown of the second switch Q2. When a second open-circuit signal or leakage signal causes the voltage at the connection point between the seventh resistor R7 and the eighth resistor R8 to increase, the second switch Q2 is turned on, thereby controlling the switch module 200 to be turned off.

[0096] As shown in Figure 2, in some embodiments, the switch trip drive unit 330 further includes a first diode D1 and a second diode D2; the anode of the first diode D1, the anode of the second diode D2, one switch pin of the first switch tube Q1, and one switch pin of the second switch tube Q2 are all connected to the connection point of the third impedance element and the fourth impedance element; the cathode of the first diode D1 is connected to the first current-carrying line; the cathode of the second diode D2, the other switch pin of the first switch tube Q1, and the other switch pin of the second switch tube Q2 are all connected to one end of the coil Lx, and the other end of the coil Lx is connected to the second current-carrying line.

[0097] The first switch tube Q1 and the second switch tube Q2 are connected in parallel between the first current-carrying line and the second current-carrying line, and are actually connected in parallel between the anode of the first diode D1 and the coil Lx. The first diode D1 limits the current to only flow from the second current-carrying line through the first switch tube Q1 to the first current-carrying line when the first switch tube Q1 is turned on, and also limits the current to only flow from the second current-carrying line through the second switch tube Q2 to the first current-carrying line when the second switch tube Q2 is turned on. When the first open-circuit signal or leakage signal causes the voltage at the connection point between the first resistor R1 and the fifth resistor R5 to increase, When the first switch tube Q1 is turned on, the second current-carrying line, the coil Lx, the first switch tube Q1, the first diode D1, and the first current-carrying line form a path. The current flowing through the coil Lx is large enough to disconnect the electromagnetic force generated by the coil Lx and the switch module 200. When the second open-circuit signal or the leakage signal causes the voltage at the connection point between the second resistor R2 and the sixth resistor R6 to increase, the second switch tube Q2 is turned on, the second current-carrying line, the coil Lx, the second switch tube Q2, the first diode D1, and the first current-carrying line form a path. The current flowing through the coil Lx is large enough to disconnect the electromagnetic force generated by the coil Lx and the switch module 200.

[0098] As shown in Figure 2, in some embodiments, a first capacitor C1 and a second capacitor C2 are further included. One end of the first capacitor C1 is connected to the control pin of the first switch tube Q1, and the other end is connected to the connection point of the third impedance element and the fourth impedance element. One end of the second capacitor C2 is connected to the control pin of the second switch tube Q2, and the other end is connected to the connection point of the third impedance element and the fourth impedance element.

[0099] One end of the first capacitor C1 is connected to the first resistor R1, and the other end of the first capacitor C1 is connected to the third resistor. One end of the second capacitor C2 is connected to the second resistor R2, and the other end of the second capacitor C2 is connected to the fourth resistor R4. When the current in the impedance network changes, for example, a first open-circuit signal or leakage signal causes the voltage at the connection point between the first resistor R1 and the fifth resistor R5 to increase, the first capacitor C1 charges and gradually increases the voltage at the control pin of the first switch Q1, thereby reaching the turn-on voltage. When a second open-circuit signal or leakage signal causes the voltage at the connection point between the second resistor R2 and the sixth resistor R6 to increase, the second capacitor C2 charges and gradually increases the voltage at the control pin of the second switch Q2, thereby reaching the turn-on voltage. Furthermore, the provision of the first and second capacitors C1 and C2 prevents large currents from directly impacting the first and second switches Q1 and Q2.

[0100] As shown in FIG2 , in some embodiments, the detection and protection device 300 further includes a test module configured to short-circuit the fifth, sixth, or seventh impedance elements upon being triggered. The test module provides a user with a test function, such that upon activation of the test module, if the LCDI device is able to disconnect the power supply line 100, it indicates that the LCDI device is functioning normally. The test module of this embodiment is connected to the fifth, sixth, or seventh resistors R5, R6, and R7 in a circuit, such that upon activation, the test module can short-circuit the fifth, sixth, or seventh resistors R5, R6, and R7. When the test module short-circuits the fifth resistor R5, the second current-carrying line passes through the coil Lx, the seventh resistor R7, and the branch where the test module is located, and is directly connected to the sixth terminal f. Since the sixth resistor R6 is also connected to the sixth terminal f, the sixth resistor R6 is also short-circuited. The voltage of the second current-carrying line passes through the seventh resistor R7 and is applied to the control pin of the first switch tube Q1 and the control pin of the second switch tube Q2, thereby turning on the first switch tube Q1 and the second switch tube Q2. The second current-carrying line is connected to the first current-carrying line through the coil Lx. The current passing through the coil Lx is large enough, so that the coil Lx generates a sufficiently large electromagnetic force to control the switch module 200 to be turned off. Similarly, when the test module short-circuits the sixth resistor R6, the second current-carrying line passes through the coil Lx, the seventh resistor R7, and the branch where the test module is located, directly connecting to the sixth terminal f. Since the fifth resistor R5 is also connected to the sixth terminal f, the fifth resistor R5 is also short-circuited. The voltage of the second current-carrying line is applied to the control pin of the first switch Q1 and the control pin of the second switch Q2 after passing through the seventh resistor R7. As a result, the first and second switches Q1 and Q2 are turned on. The second current-carrying line is connected to the first current-carrying line through the coil Lx. The current flowing through the coil Lx is sufficiently large to generate a sufficiently large electromagnetic force in the coil Lx to open the switch module 200. When the test module short-circuits the seventh resistor R7, the voltage divider across the fifth and sixth resistors R5 and R6 increases, increasing the voltages at the control pins of the first and second switches Q1 and Q2. As a result, the first and second switches Q1 and Q2 are turned on. The second current-carrying line is connected to the first current-carrying line through the coil Lx. The current flowing through the coil Lx is sufficiently large to generate a sufficiently large electromagnetic force in the coil Lx to open the switch module 200.

[0101] Specifically, the test module includes a test switch TEST, and the test switch TEST is connected in parallel with the fifth impedance element, the sixth impedance element, or the seventh impedance element;

[0102] Alternatively, one end of the test switch TEST is connected to a connection point between the fifth impedance element and the sixth impedance element, and the other end is connected to a connection point between the seventh impedance element and the coil Lx.

[0103] The test switch TEST is connected in parallel across the fifth resistor R5 or the sixth resistor R6. When the test switch TEST is closed, the fifth resistor R5 or the sixth resistor R6 is short-circuited. Based on the above analysis, the sixth resistor R6 or the fifth resistor R5 is further short-circuited, triggering the first switch Q1 and the second switch Q2 to conduct, ultimately causing the coil Lx to generate an electromagnetic force that controls the switch module 200 to open. In Figure 2, the test switch TEST is connected in parallel with the seventh resistor R7. When the test switch TEST is closed, the second current-carrying line passes through the coil Lx and the branch containing the test switch TEST, causing the voltage across the fifth resistor R5 or the sixth resistor R6 to increase. This in turn causes the first switch Q1 and the second switch Q2 to conduct, and the second current-carrying line is connected to the first current-carrying line through the coil Lx. The current flowing through the coil Lx is sufficiently large that the coil Lx generates a sufficiently large electromagnetic force that controls the switch module 200 to open.

[0104] Alternatively, one end of the test switch TEST may be set at the junction of the fifth resistor R5 and the sixth resistor R6, and the other end may be connected to the junction of the seventh resistor R7 and the coil Lx. Since the fifth resistor R5 and the sixth resistor R6 are both connected to the seventh resistor R7, this configuration of the test switch TEST is effectively connected in parallel with the seventh resistor R7. When the test switch TEST is closed, it effectively short-circuits the seventh resistor R7, triggering the first switch Q1 and the second switch Q2 to turn on, causing the coil Lx to generate a sufficiently large electromagnetic force to control the disconnection of the switch module 200.

[0105] As shown in Figure 2, some embodiments further include a lightning protection module 600, one end of which is connected to the first current-carrying line, and the other end of which is respectively connected to the second current-carrying line and one end of the coil Lx. The lightning protection module 600 includes a first varistor ZR1 between the first and second current-carrying lines. When a sudden high current flows between the first and second current-carrying lines, the resistance of the first varistor ZR1 rapidly increases, protecting the circuit from high current shocks. Furthermore, a second varistor ZR2 is also provided in the switch trip drive unit 330. The second current-carrying line, coil Lx, second varistor ZR2, first diode D1, and first current-carrying line are sequentially connected. The second varistor ZR2 is used to prevent sudden high currents in the switch trip drive unit 330 from shocking circuit components.

[0106] As shown in FIG2 , in some embodiments, an LED indicator unit 700 is further included in parallel with the switch unit. The LED indicator unit 700 includes an eighth impedance element and a light-emitting diode LED1 connected in series. One end of the LED indicator unit 700 is connected to the first current-carrying line via a first diode D1, and the other end is connected to the second current-carrying line via a coil Lx. When the circuit is operating normally, the current in the second current-carrying line passes through the coil Lx and reaches the light-emitting diode LED1, and then passes through the first diode D1 to the first current-carrying line. At this time, the light-emitting diode LED1 emits light, notifying the user of the current operating status of the LCD device. The eighth impedance element is shown in FIG2 as a series connection of an eighth resistor R8 and a ninth resistor R9. It is understood that the eighth resistor R8 and the ninth resistor R9 can be a single resistor element or a resistor network composed of multiple resistors connected in series, in parallel, or in series and parallel. The eighth resistor R8 and the ninth resistor R9 can also be other voltage-dropping elements or combinations thereof, such as inductors, capacitors, or any combination of capacitors, inductors, and resistors.

[0107] Through the above-mentioned detection and protection device 300, when the first shielding conductor structure 110 and / or the second shielding conductor structure 120 is open-circuited, or when the first shielding conductor structure 110 and / or the second shielding conductor structure 120 controls the switch module 200 to have a leakage current, the power connection between the input end and the output end of the power cord 100 can be disconnected, thereby realizing the disconnection of the power connection of the power cord 100 triggered by leakage current, and also realizing the disconnection of the power connection of the power cord 100 triggered by the open circuit of the shielding line.

[0108] The following describes in detail the detection and protection device 300 according to an embodiment of the present application through a specific example.

[0109] Refer to the circuit diagram of the detection protection device 300 shown in FIG. 2 .

[0110] The first shielded conductor structure 110 of the power line 100 has a first end a set near the input end of the power line 100, a second end b set near the output end of the power line 100, and a third end c set between the first end a and the second end b. The second shielded conductor structure 120 of the power line 100 has a fourth end d set near the input end of the power line 100, a fifth end e set near the output end of the power line 100, and a sixth end f set between the fourth end d and the fifth end e, and the third end c and the sixth end f are connected.

[0111] The detection and protection device 300 is connected to the first shielded conductor structure 110 and the second shielded conductor structure 120 to implement leakage detection and open circuit detection. Specifically, the detection and protection device 300 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7, wherein the first resistor R1, the third resistor R3, and the fifth resistor R5 are connected in series to form a first series branch, the second resistor R2, the fourth resistor R4, and the sixth resistor R6 are connected in series to form a second series branch, the fifth resistor R5 and the sixth resistor R6 are connected to the second current-carrying line via the seventh resistor R7 and the coil Lx, the third resistor R3 and the fourth resistor R4 are connected to the first current-carrying line via a first diode D1, the connection point between the first resistor R1 and the third resistor R3 is connected to the first end a, the connection point between the first resistor R1 and the fifth resistor R5 is connected to the fourth end d, the connection point between the second resistor R2 and the fourth resistor R4 is connected to the second end b, and the connection point between the second resistor R2 and the sixth resistor R6 is connected to the fifth end e.

[0112] The switch trip drive unit 330 includes a first switching transistor Q1 and a second switching transistor Q2. The control pin of the first switching transistor Q1 is connected to the connection point between the first resistor R1 and the fifth resistor R5, and the control pin of the second switching transistor Q2 is connected to the connection point between the second resistor R2 and the sixth resistor R6. The first switching transistor Q1 and the second switching transistor Q2 are connected in parallel, and one switch pin of each is connected to the connection point between the third resistor R3 and the fourth resistor R4, and the other switch pin is connected to the connection point between the first resistor R1 and the second resistor R2.

[0113] The detection and protection device 300 further includes a test switch TEST, which is connected in parallel with the seventh resistor R7.

[0114] When a sufficiently large current passes through the coil Lx, the electromagnetic force can be used to control the switch module 200 to disconnect. The switch module 200 is connected to the first current-carrying line and the second current-carrying line and disconnects itself, thereby disconnecting the mains power from the electrical equipment.

[0115] 3 , when no leakage current or open circuit occurs in the first shielding conductor structure 110 and the second shielding conductor structure 120 , the LCDI device operates normally, and four current paths are formed:

[0116] The first current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth terminal d, the sixth terminal f, the third terminal c, the first terminal a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0117] The second current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth terminal d, the sixth terminal f, the third terminal c, the second terminal b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0118] The third current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the sixth resistor R6, the fifth terminal e, the sixth terminal f, the third terminal c, the second terminal b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0119] The fourth current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the sixth resistor R6, the fifth terminal e, the sixth terminal f, the third terminal c, the first terminal a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0120] Because the impedance network formed by the seventh resistor R7, the fifth resistor R5, the sixth resistor R6, the third resistor R3, and the fourth resistor R4 reduces the current in the above-mentioned current path, the current flowing through the coil Lx is not large enough to disconnect the switch module 200. In addition, the voltage at the connection point between the first resistor R1 and the fifth resistor R5 is insufficient to turn on the first switch Q1, and the voltage at the connection point between the second resistor R2 and the sixth resistor R6 is insufficient to turn on the second switch Q2.

[0121] 4 and 5 , when leakage current occurs in the first shielding conductor structure 110 and / or the second shielding conductor structure 120 , the voltage at the connection point between the first resistor R1 and the fifth resistor R5 increases, and the voltage at the connection point between the second resistor R2 and the sixth resistor R6 increases. Multiple current paths are simultaneously formed according to the different positive voltages of the first current-carrying line and the second current-carrying line:

[0122] When the first current-carrying line is at positive voltage:

[0123] First current path: first shielding conductor structure 110 , fifth resistor R5 , seventh resistor R7 , coil Lx, second current-carrying line;

[0124] Second current path: first shielding conductor structure 110 , third resistor R3 , second diode D2 , coil Lx, second current-carrying line;

[0125] The third current path: the first shielding conductor structure 110 , the sixth resistor R6 , the seventh resistor R7 , the coil Lx, and the second current-carrying line;

[0126] Fourth current path: first shielding conductor structure 110 , fourth resistor R4 , second diode D2 , coil Lx, second current-carrying line;

[0127] When the second current-carrying line is at positive voltage:

[0128] First current path: second shielding conductor structure 120 , third resistor R3 , first diode D1 , first current-carrying line;

[0129] Second current path: second shielding conductor structure 120 , fourth resistor R4 , first diode D1 , first current-carrying line;

[0130] In both of the above situations, the voltage at the connection point between the first resistor R1 and the fifth resistor R5 increases, triggering the first switch tube Q1 to turn on. At this time, the second current-carrying line passes through the coil Lx, the first switch tube Q1, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to be disconnected. Similarly, the voltage at the connection point between the second resistor R2 and the sixth resistor R6 increases, triggering the second switch tube Q2 to turn on. At this time, the second current-carrying line passes through the coil Lx, the second switch tube Q2, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to be disconnected.

[0131] When the first shielding conductor structure 110 and / or the second shielding conductor structure 120 is open-circuited, there are several open-circuit situations, which are described below respectively.

[0132] 1. As shown in FIG6 , when the first shielding conductor structure 110 between the first end a and the third end c is open-circuited, four current paths are formed simultaneously:

[0133] The first current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth terminal d, the sixth terminal f, the third terminal c, the second terminal b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0134] The second current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the first resistor R1, the third resistor R3, the first diode D1, and the first current-carrying line;

[0135] The third current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the sixth resistor R6, the fifth terminal e, the sixth terminal f, the third terminal c, the second terminal b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0136] The fourth current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the sixth resistor R6, the fifth terminal e, the sixth terminal f, the fourth terminal d, the first resistor R1, the third resistor R3, the first diode D1, and the first current-carrying line;

[0137] At this point, the fifth resistor R5 and the sixth resistor R6 are connected in parallel in the impedance network, while the first resistor R1 and the third resistor R3 are connected in series and in parallel with the fourth resistor R4. The voltage at the connection point between the first resistor R1 and the fifth resistor R5 increases, triggering the first switch Q1 to turn on. The second current-carrying line then flows through the coil Lx, the first switch Q1, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is sufficiently large to generate sufficient electromagnetic force to cause the switch module 200 to turn off. Similarly, the voltage at the connection point between the second resistor R2 and the sixth resistor R6 increases, triggering the second switch Q2 to turn on. The second current-carrying line then flows through the coil Lx, the second switch Q2, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is sufficiently large to generate sufficient electromagnetic force to cause the switch module 200 to turn off.

[0138] 2. As shown in FIG7 , when the first shielding conductor structure 110 between the third end c and the second end b is open-circuited, four current paths are formed simultaneously:

[0139] The first current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth terminal d, the sixth terminal f, the third terminal c, the first terminal a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0140] The second current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth terminal d, the sixth terminal f, the fifth terminal e, the second resistor R2, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0141] The third current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the sixth resistor R6, the second resistor R2, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0142] The fourth current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the sixth resistor R6, the fifth terminal e, the sixth terminal f, the third terminal c, the first terminal a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0143] At this point, the fifth resistor R5 and the sixth resistor R6 are connected in parallel in the impedance network, while the second resistor R2 and the fourth resistor R4 are connected in series and in parallel with the third resistor R3. The voltage at the connection point between the first resistor R1 and the fifth resistor R5 increases, triggering the first switch Q1 to turn on. The second current-carrying line then flows through the coil Lx, the first switch Q1, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is sufficiently large to generate sufficient electromagnetic force to cause the switch module 200 to turn off. Similarly, the voltage at the connection point between the second resistor R2 and the sixth resistor R6 increases, triggering the second switch Q2 to turn on. The second current-carrying line then flows through the coil Lx, the second switch Q2, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is sufficiently large to generate sufficient electromagnetic force to cause the switch module 200 to turn off.

[0144] 3. Referring to FIG. 8 , when the second shielding conductor structure 120 between the fourth end d and the sixth end f is open-circuited, four current paths are formed simultaneously:

[0145] The first current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the first resistor R1, the third resistor R3, the first diode D1, and the first current-carrying line;

[0146] The second current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth end d, the first resistor R1, the first end a, the third end c, the second end b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0147] The third current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the sixth resistor R6, the fifth terminal e, the sixth terminal f, the third terminal c, the first terminal a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0148] The fourth current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the sixth resistor R6, the fifth terminal e, the sixth terminal f, the third terminal c, the second terminal b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0149] At this point, the third resistor R3 and the fourth resistor R4 in the impedance network are connected in parallel, the fifth resistor R5 and the first resistor R1 are connected in series and then connected in parallel with the sixth resistor R6. The voltage at the connection point between the second resistor R2 and the sixth resistor R6 increases, triggering the second switch tube Q2 to turn on. At this time, the second current-carrying line passes through the coil Lx, the second switch tube Q2, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to be disconnected.

[0150] 4. As shown in FIG9 , when the second shielding conductor structure 120 between the sixth end f and the fifth end e is open-circuited, four current paths are formed simultaneously:

[0151] The first current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth terminal d, the sixth terminal f, the third terminal c, the first terminal a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0152] The second current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth terminal d, the sixth terminal f, the third terminal c, the second terminal b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0153] The third current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the second current-carrying line, the sixth resistor R6, the second resistor R2, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0154] The fourth current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the sixth resistor R6, the fifth terminal e, the second resistor R2, the second terminal b, the third terminal c, the first terminal a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0155] At this point, the third resistor R3 and the fourth resistor R4 in the impedance network are connected in parallel, the sixth resistor R6 and the second resistor R2 are connected in series and then connected in parallel with the fifth resistor R5. The voltage at the connection point between the first resistor R1 and the fifth resistor R5 increases, triggering the first switch tube Q1 to turn on. At this time, the second current-carrying line passes through the coil Lx, the first switch tube Q1, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to be disconnected.

[0156] 5. As shown in FIG10 , when the connection between the third terminal c and the sixth terminal f is open, two current paths are formed simultaneously:

[0157] First current path: second current-carrying line, coil Lx, seventh resistor R7, fifth resistor R5, first resistor R1, third resistor R3, first diode D1, first current-carrying line;

[0158] Second current path: second current-carrying line, coil Lx, seventh resistor R7, sixth resistor R6, second resistor R2, fourth resistor R4, first diode D1, first current-carrying line;

[0159] At this point, the fifth resistor R5, the first resistor R1, and the third resistor R3 in the impedance network are connected in series to form a first series branch, the sixth resistor R6, the second resistor R2, and the fourth resistor R4 are connected in series to form a second series branch, and the first and second series branches are connected in parallel. The voltage at the connection point between the first resistor R1 and the fifth resistor R5 increases, triggering the first switch Q1 to turn on. At this time, the second current-carrying line passes through the coil Lx, the first switch Q1, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to turn off. Similarly, the voltage at the connection point between the second resistor R2 and the sixth resistor R6 increases, triggering the second switch Q2 to turn on. At this time, the second current-carrying line passes through the coil Lx, the second switch Q2, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to turn off.

[0160] 11 , when the test switch TEST is closed, four current paths are formed simultaneously:

[0161] The first current path is the second current-carrying line, the coil Lx, the test switch TEST, the fifth resistor R5, the fourth terminal d, the sixth terminal f, the third terminal c, the first terminal a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0162] The second current path is the second current-carrying line, the coil Lx, the test switch TEST, the fifth resistor R5, the fourth terminal d, the sixth terminal f, the third terminal c, the second terminal b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0163] The third current path is the second current-carrying line, the coil Lx, the test switch TEST, the sixth resistor R6, the fifth terminal e, the sixth terminal f, the third terminal c, the second terminal b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0164] The fourth current path is the second current-carrying line, the coil Lx, the test switch TEST, the sixth resistor R6, the fifth terminal e, the sixth terminal f, the third terminal c, the first terminal a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0165] The test switch TEST short-circuits the seventh resistor R7, and the voltage at the connection point between the first resistor R1 and the fifth resistor R5 increases, triggering the first switch tube Q1 to turn on. At this time, the second current-carrying line passes through the coil Lx, the first switch tube Q1, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to be disconnected. Similarly, the voltage at the connection point between the second resistor R2 and the sixth resistor R6 increases, triggering the second switch tube Q2 to turn on. At this time, the second current-carrying line passes through the coil Lx, the second switch tube Q2, and the first diode D1 to the first current-carrying line. The current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to be disconnected.

[0166] 12 , an embodiment of the second aspect of the present application provides an electrical connection device 800 , comprising a detection and protection device 300 as in any of the above embodiments, a shell 810 , and a power cord 100 , wherein the power cord 100 is connected to the shell 810 , and the detection and protection device 300 is disposed in the shell 810 .

[0167] In addition, a third embodiment of the present application provides an electrical device, including a load device and an electrical connection device 800 as described in the above embodiment, wherein the output end of the power cord 100 is connected to the load device.

[0168] The power line detection and protection device, electrical connection device, and electrical equipment of the embodiments of the present application have at least the following beneficial effects: in the power line, any of the first shielded conductor structure between the first end and the third end, the first shielded conductor structure between the third end and the second end, the second shielded conductor structure between the fourth end and the sixth end, the second shielded conductor structure between the sixth end and the fifth end, and the conductor structure between the third end and the sixth end can be used to detect open circuits and conduct leakage signals; when the first shielded conductor structure and / or the second shielded conductor structure is open circuited, the first impedance element can generate a first open circuit signal, and the second impedance element can generate a second open circuit signal; when the switch trip drive unit detects the first open circuit signal, the second open circuit signal, or the leakage signal, it can control the switch module to disconnect the power connection between the input end and the output end of the power line. In this way, when the integrity of the first shielded conductor structure and / or the second shielded conductor structure is destroyed, that is, when an open circuit occurs, the power connection of the power line can be triggered to be disconnected by the corresponding open circuit signal, thereby ensuring power safety.

[0169] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A detection and protection device for a power line, wherein: The power line comprises a first current-carrying line and a second current-carrying line, the power line further comprises a first shielded conductor structure covering the first current-carrying line and a second shielded conductor structure covering the second current-carrying line, the first shielded conductor structure comprises a first end close to the input end of the power line, a second end close to the output end of the power line, and a third end located between the first end and the second end, the second shielded conductor structure comprises a fourth end close to the input end of the power line, a fifth end close to the output end of the power line, and a sixth end located between the fourth end and the fifth end; The third end is connected to the sixth end; The detection and protection device comprises: A switch module, used to control the power connection between the input end and the output end of the power line; A driving module, comprising a switch tripping driving unit, a first impedance element and a second impedance element; the first impedance element is connected between the first end and the fourth end, and the second impedance element is connected between the second end and the fifth end; The first impedance element is configured to generate a first open circuit signal when the first shielding conductor structure and / or the second shielding conductor structure is open circuited; the second impedance element is configured to generate a second open circuit signal when the first shielding conductor structure and / or the second shielding conductor structure is open circuited; and The trip switch drive unit is configured to control the switch module to disconnect the power connection between the input end and the output end of the power line when receiving the first open circuit signal or the second open circuit signal, or detecting a leakage signal of the first shielded conductor structure or the second shielded conductor structure.

2. The detection and protection device according to claim 1, wherein: The first impedance element is further configured to generate the first open circuit signal when an open circuit occurs at at least one of the following positions: a first shielding conductor structure between the first end and the third end; a second shielding conductor structure between the fourth end and the sixth end; a connection between the third end and the sixth end; The second impedance element is further configured to generate the second open circuit signal when an open circuit occurs at at least one of the following positions: a first shielding conductor structure between the second end and the third end; a second shielding conductor structure between the fifth end and the sixth end; A connection between the third end and the sixth end.

3. The detection and protection device according to claim 1 or 2, wherein: The driving module further includes a third impedance element, a fourth impedance element, a fifth impedance element and a sixth impedance element; the third impedance element, the first impedance element and the fifth impedance element are sequentially connected in series to form a first series branch, and the fourth impedance element, the second impedance element and the sixth impedance element are sequentially connected in series to form a second series branch; A connection point between the first impedance element and the third impedance element is connected to the first end, a connection point between the first impedance element and the fifth impedance element is connected to the fourth end, a connection point between the second impedance element and the fourth impedance element is connected to the second end, and a connection point between the second impedance element and the sixth impedance element is connected to the fifth end.

4. The detection and protection device according to claim 3, wherein: The driving module further includes a seventh impedance element, and the fifth impedance element and the sixth impedance element are both connected to the second current-carrying line through the seventh impedance element.

5. The detection and protection device according to claim 4, wherein: The switch tripping drive unit includes a switch unit and a coil for generating an electromagnetic force to drive the switch module. The second current-carrying line, the coil, the switch unit and the first current-carrying line are connected in sequence so that when the switch unit is turned on, the electromagnetic force of the coil is used to control the switch module to disconnect the power connection between the input end and the output end of the power line.

6. The detection and protection device according to claim 5, wherein: The fifth impedance element and the sixth impedance element are both connected to the second current-carrying line through the seventh impedance element and the coil.

7. The detection and protection device according to claim 5 or 6, wherein: The switch unit includes a first switch tube and a second switch tube, a connection point between the first impedance element and the fifth impedance element is connected to a control pin of the first switch tube, and a connection point between the second impedance element and the sixth impedance element is connected to a control pin of the second switch tube.

8. The detection and protection device according to claim 7, wherein: The switch tripping drive unit also includes a first diode and a second diode; the anode of the first diode, the anode of the second diode, a switch pin of the first switch tube, and a switch pin of the second switch tube are all connected to the connection point of the third impedance element and the fourth impedance element; the cathode of the first diode is connected to the first current-carrying line; the cathode of the second diode, another switch pin of the first switch tube, and another switch pin of the second switch tube are all connected to one end of the coil, and the other end of the coil is connected to the second current-carrying line.

9. The detection and protection device according to claim 7 or 8 further includes a first capacitor and a second capacitor, one end of the first capacitor is connected to the control pin of the first switch tube, and the other end is connected to the connection point between the third impedance element and the fourth impedance element, and one end of the second capacitor is connected to the control pin of the second switch tube, and the other end is connected to the connection point between the third impedance element and the fourth impedance element. 10 . The detection and protection device according to claim 6 , further comprising a test module, wherein the test module is configured to short-circuit the fifth impedance element, the sixth impedance element or the seventh impedance element after being triggered.

11. The detection and protection device according to claim 10, wherein: The test module comprises a test switch, and the test switch is connected in parallel with the fifth impedance element, the sixth impedance element or the seventh impedance element; Alternatively, one end of the test switch is connected to a connection point between the fifth impedance element and the sixth impedance element, and the other end is connected to a connection point between the seventh impedance element and the coil.

12. The detection and protection device according to any one of claims 5 to 11, further comprising a lightning protection module, one end of which is connected to the first current-carrying line, and the other end of which is respectively connected to the second current-carrying line and one end of the coil. 13 . The detection and protection device according to claim 5 , further comprising an LED indication unit connected in parallel with the switch unit, wherein the LED indication unit comprises an eighth impedance element and a light emitting diode connected in series.

14. An electrical connection device, comprising a housing, a power cord and the detection and protection device according to any one of claims 1 to 13, wherein: The power line is connected to the detection and protection device, and the detection and protection device is arranged inside the shell.

15. An electrical device, comprising a load device and the electrical connection device according to claim 14, wherein: The output end of the power line is connected to the load device.

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