Power cable detection protection apparatus, electric connection device and electrical device

Abstract

Disclosed in the present application are a power cable detection protection apparatus, an electric connection device and an electrical device. A first shielding conductor structure (110) and a second shielding conductor structure (120) are provided in a power cable (100); when the first shielding conductor structure (110) and / or the second shielding conductor structure (120) is open-circuit, a first detection module (310) can generate a first open-circuit signal, and a second detection module (320) can generate a second open-circuit signa; when detecting the first open-circuit signal, the second open-circuit signal or an electric leakage signal, a driving module (330) can control a switch module (200) to cut off an electric connection between an input end of the power cable (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 priority to Chinese patent application No. 202311621662.6 filed on November 29, 2023, entitled “Detection and protection device, electrical connection device and electrical equipment for power lines”, and No. 202323249845.8 filed on November 29, 2023, entitled “Detection and protection device, electrical connection device and electrical equipment for power lines”, the entire contents of which are incorporated by reference into this application. 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 first detection module, configured to generate a first open circuit signal when the first shielding conductor structure and / or the second shielding conductor structure is open circuited;

[0012] a second detection module, 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

[0013] The driving module 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 the first open circuit signal, the second open circuit signal, or the leakage signal of the first shielded conductor structure or the second shielded conductor structure is detected.

[0014] In some embodiments, the first detection module 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 second shielding conductor structure between the fourth end and the sixth end;

[0016] a first shielding conductor structure between the first end and the third end;

[0017] a second shielding conductor structure between the fifth end and the sixth end;

[0018] a connection between the third end and the sixth end;

[0019] The second detection module is further configured to generate the second open circuit signal when an open circuit occurs at at least one of the following positions:

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

[0021] a first shielding conductor structure between the second end and the third end;

[0022] a second shielding conductor structure between the fourth end and the sixth end;

[0023] A connection between the third end and the sixth end.

[0024] In some embodiments, the first detection module includes a first impedance element, the first end is connected to the second current-carrying line through the first impedance element, the second detection module includes a second impedance element, the second end is connected to the second current-carrying line through the second impedance element, the first connection end of the driving module is connected to the connection point between the first impedance element and the first end, the second connection end of the driving module is connected to the connection point between the second impedance element and the second end, and the third connection end of the driving module is connected to the first current-carrying line.

[0025] In some embodiments, the detection protection device further includes a third impedance element and a fourth impedance element, the fourth end is connected to the first current-carrying line through the third impedance element, and the fifth end is connected to the first current-carrying line through the fourth impedance element;

[0026] In a case where an open circuit occurs in the second shielded conductor structure between the fourth end and the sixth end, the first impedance element is configured to cooperate with the fourth impedance element to generate the first open circuit signal, and the second impedance element is configured to cooperate with the fourth impedance element to generate the second open circuit signal;

[0027] In a case where an open circuit occurs in the second shielded conductor structure between the fifth end and the sixth end, the first impedance element is configured to cooperate with the third impedance element to generate the first open circuit signal, and the second impedance element is configured to cooperate with the third impedance element to generate the second open circuit signal;

[0028] In a case where an open circuit occurs in the first shielded conductor structure between the first end and the third end, the first impedance element is configured to generate the first open circuit signal;

[0029] In a case where an open circuit occurs in the first shielded conductor structure between the second end and the third end, the second impedance element is configured to generate the second open circuit signal;

[0030] In a case where an open circuit occurs at the connection between the third terminal and the sixth terminal, the first impedance element is configured to generate the first open circuit signal, and the second impedance element is configured to generate the second open circuit signal.

[0031] In some embodiments, the driving module includes a fifth impedance element, a sixth impedance element, a first Zener diode and a second Zener diode, one end of the fifth impedance element is connected to the connection point between the third impedance element and the fourth impedance element, the other end of the fifth impedance element is connected to the positive electrode of the first Zener diode and the positive electrode of the second Zener diode through the sixth impedance element, the negative electrode of the first Zener diode is connected to the connection point between the first impedance element and the first end, and the negative electrode of the second Zener diode is connected to the connection point between the second impedance element and the second end.

[0032] In some embodiments, the detection and protection device also includes a switch tripping drive unit, which 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 and output ends of the power line.

[0033] In some embodiments, the switch unit includes a first switch tube, and a connection point between the fifth impedance element and the sixth impedance element is connected to a control pin of the first switch tube.

[0034] In some embodiments, the switch trip drive unit further includes a first diode and a second diode; the anode of the first diode, the anode of the second diode, and one switch pin of the first 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 and the other switch pin of the first switch tube are both connected to one end of the coil, and the other end of the coil is connected to the second current-carrying line.

[0035] In some embodiments, the detection and protection device further includes a test module, and the test module is configured to short-circuit the first detection module and / or the second detection module after being triggered.

[0036] In some embodiments, the test module includes a test switch, and the first impedance element and the second impedance element are connected to the second current-carrying line through the coil;

[0037] The test switch is connected in parallel with the first impedance element or the second impedance element;

[0038] Alternatively, one end of the test switch is connected to a connection point between the first impedance element and the second impedance element, and the other end is connected to the first shielding conductor structure or the second shielding conductor structure.

[0039] 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.

[0040] In some embodiments, an LED indication unit is further included in parallel with the switch unit, and the LED indication unit includes a seventh impedance element and a light emitting diode connected in series.

[0041] 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.

[0042] 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.

[0043] 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

[0044] FIG1 is a schematic diagram of module connections of a detection and protection device provided in an embodiment of the present application;

[0045] FIG2 is a circuit diagram of a detection and protection device provided in an embodiment of the present application;

[0046] 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;

[0047] 4 is a schematic diagram of current flow when there is leakage current in the first shielding conductor structure and / or the second shielding conductor structure provided by an embodiment of the present application;

[0048] 5 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;

[0049] 6 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;

[0050] 7 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;

[0051] 8 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;

[0052] FIG9 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;

[0053] FIG10 is a schematic diagram of current flow when the test switch provided in an embodiment of the present application is closed; and

[0054] FIG11 is a schematic diagram of an electrical connection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] 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.

[0056] 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.

[0057] 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).

[0058] 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.

[0059] 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. The detection and protection device is configured with a first detection module and a second detection module, which are respectively used to detect the open circuit conditions 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 driving module in the detection and protection device receives the first open circuit signal and the second open circuit signal, and can then 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, and disconnect the power connection of the power line when an open circuit occurs in the shielding layer, thereby ensuring power safety.

[0060] The following describes the power line detection and protection device, electrical connection equipment and electrical equipment with reference to the accompanying drawings.

[0061] 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.

[0062] The detection and protection device 300 includes:

[0063] The switch module 200 is used to control the power connection between the input end and the output end of the power line 100;

[0064] The first detection module 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;

[0065] The second detection module 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;

[0066] The driving module 330 is configured to control the switch module 200 to disconnect the power connection between the input and output ends of the power line 100 when detecting the first open circuit signal, the second open circuit signal, or the leakage signal of the first shielding conductor structure 110 or the second shielding conductor structure 120.

[0067] 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 shielding conductor structure 110, and the second current-carrying line is wrapped by a second shielding conductor structure 120. An insulation skin of the first current-carrying line is provided between the first current-carrying line and the first shielding conductor structure 110, and an insulation skin of the second current-carrying line is provided between the second current-carrying line and the second shielding conductor structure 120. In the case where leakage current occurs, after the insulation skin on the surface of the first current-carrying line is damaged, when the first current-carrying line contacts the first shielding conductor structure 110, causing leakage current in the first shielding conductor structure 110, the leakage signal of the leakage current can be detected by the driving module 330, thereby triggering the disconnection of the switch module 200. Similarly, after the insulation skin on the surface of the second current-carrying line is damaged, when the second current-carrying line contacts the second shielding conductor structure 120, causing leakage current in the second shielding conductor structure 120, the leakage signal of the leakage current can be detected by the driving module 330, thereby triggering Disconnect the switch module 200; when an open circuit occurs, an open circuit occurs on the first shielding conductor structure 110, and the first detection unit and the second detection unit can both generate corresponding open circuit signals, so that the driving module 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 detection unit and the second detection unit can both generate corresponding open circuit signals, so that the driving module 330 detects the first open circuit signal and the second open circuit signal, thereby triggering the disconnection of the switch module 200.

[0068] On the power line 100, the first end a of the first shielded conductor structure 110 can be connected to the detection and protection device 300 via a first wire 410, the second end b can be connected to the detection and protection device 300 via a first return wire 510, the fourth end d of the second shielded conductor structure 120 can be connected to the detection and protection device 300 via a second wire 420, and the fifth end e can be connected to the detection and protection device 300 via a second return wire 520. The detection and protection device 300 forms a detection path through the first detection module 310 and the second detection module 320 with 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.

[0069] 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 detection module 310 is further configured to generate a first open circuit signal when an open circuit occurs at at least one of the following locations:

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

[0071] a first shielding conductor structure 110 between the first end a and the third end c;

[0072] a second shielding conductor structure 120 between the fifth end e and the sixth end f;

[0073] a connection between the third terminal c and the sixth terminal f;

[0074] It can be seen from this that the first open circuit signal of the first detection module 310 is generated when an open circuit occurs at any of the four corresponding positions mentioned above; in the case where an open circuit occurs at the above four positions, the driving module 330 triggers the control switch module 200 through the first open circuit signal to disconnect the power connection between the input end and the output end of the power line 100.

[0075] The second detection module 320 is further configured to generate a second open circuit signal when an open circuit occurs at at least one of the following locations:

[0076] a second shielding conductor structure 120 between the fifth end e and the sixth end f;

[0077] a first shielding conductor structure 110 between the second end b and the third end c;

[0078] a second shielding conductor structure 120 between the fourth end d and the sixth end f;

[0079] The connection between the third terminal c and the sixth terminal f.

[0080] It can be seen from this that the first open circuit signal of the first detection module 310 is generated when an open circuit occurs at any of the four corresponding positions mentioned above, and the second open circuit signal of the second detection module 320 is generated when an open circuit occurs at any of the four corresponding positions mentioned above; in response to the situation where an open circuit occurs at the above four positions, the driving module 330 triggers the control switch module 200 through the second open circuit signal to disconnect the power connection between the input end and the output end of the power line 100.

[0081] 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.

[0082] The specific circuit structure of the detection and protection device 300 is described below by way of example.

[0083] As shown in Figure 2, in some embodiments, the first detection module 310 includes a first impedance element, the first end a is connected to the second current-carrying line through the first impedance element, the second detection module 320 includes a second impedance element, the second end b is connected to the second current-carrying line through the second impedance element, the first connection end of the driving module 330 is connected to the connection point between the first impedance element and the first end a, the second connection end of the driving module 330 is connected to the connection point between the second impedance element and the second end b, and the third connection end of the driving module 330 is connected to the first current-carrying line.

[0084] For the sake of convenience, in this embodiment, the first impedance element is represented as a first resistor R1 in FIG. 2 , and the second impedance element is represented as a second resistor R2 in FIG. 2 ; it is understandable that the first resistor R1 and the second resistor R2 may be single resistor elements, or a resistor network consisting of multiple resistors connected in series, in parallel, or in series and parallel. The first resistor R1 and the second resistor R2 may also be other voltage drop elements and combinations thereof, such as inductors, capacitors, or any combination of capacitors, inductors, and resistors.

[0085] One end of the first resistor R1 is connected to the second current-carrying line, and the other end of the first resistor R1 is connected to the first end a and the first connection end of the driver module 330. One end of the second resistor R2 is connected to the second current-carrying line, and the other end of the second resistor R2 is connected to the second end b and the second connection end of the driver module 330. Therefore, both the first resistor R1 and the second resistor R2 are connected to the second current-carrying line. Current from the second current-carrying line flows through the first resistor R1 to the driver module 330 and the first end a, and also through the second resistor R2 to the driver module 330 and the second end b. Since the first end a and the second end b are both located on the first shielded conductor structure 110, and the first shielded conductor structure 110 is also conductively connected to the sixth end f of the second shielded conductor structure 120 via the third end c, and the third end c of the first shielded conductor structure 110 is connected to the first end a and the second end b, the second current-carrying line is effectively connected to the first and second shielded conductor structures 110 and 120 via the first resistor R1 and the second resistor R2, and the driver module 330 is also connected to the first and second shielded conductor structures 110 and 120. It can be seen from this that when an open circuit occurs on the first shielded conductor structure 110 and the second shielded conductor structure 120, the current conditions of the first shielded conductor structure 110 and the second shielded conductor structure 120 change; at this time, the current flowing through the first resistor R1 changes, and the current change corresponds to the first open circuit signal, thereby triggering the driving module 330. Similarly, the current flowing through the second resistor R2 changes, and the current change corresponds to the second open circuit signal, thereby triggering the driving module 330, thereby realizing open circuit detection of the shielded line.

[0086] 2 , in some embodiments, the detection and protection device 300 further includes a third impedance element and a fourth impedance element, the fourth end d is connected to the first current-carrying line through the third impedance element, and the fifth end e is connected to the first current-carrying line through the fourth impedance element;

[0087] In the case where an open circuit occurs in the first shielded conductor structure 110 between the fourth end d and the sixth end f, the first impedance element is configured to cooperate with the fourth impedance element to generate a first open circuit signal, and the second impedance element is configured to cooperate with the fourth impedance element to generate a second open circuit signal;

[0088] In the case where an open circuit occurs in the first shielded conductor structure 110 between the fifth end e and the sixth end f, the first impedance element is configured to cooperate with the third impedance element to generate a first open circuit signal, and the second impedance element is configured to cooperate with the third impedance element to generate a second open circuit signal;

[0089] In the case that an open circuit occurs in the second shielding conductor structure 120 between the first end a and the third end c, the first impedance element is configured to generate a first open circuit signal;

[0090] In the case that an open circuit occurs in the second shielding conductor structure 120 between the second end b and the third end c, the second impedance element is configured to generate a second open circuit signal;

[0091] In a case where an open circuit occurs in the connection between the third terminal c and the sixth terminal f, the first impedance element is configured to generate a first open circuit signal, and the second impedance element is configured to generate a second open circuit signal.

[0092] For the sake of convenience, in this embodiment, the third impedance element is represented as a third resistor R3 in FIG. 2 , and the fourth impedance element is represented as a fourth resistor R4 in FIG. 2 ; it is understandable that the third resistor R3 and the fourth resistor R4 may be a single resistor element, or a resistor network consisting of multiple resistors connected in series, in parallel, or in series and parallel. The third resistor R3 and the fourth resistor R4 may also be other voltage drop elements and combinations thereof, such as inductors, capacitors, or any combination of capacitors, inductors, and resistors.

[0093] One end of the third resistor R3 is connected to the first current-carrying line, the other end of the third resistor R3 is connected to the fourth end d, 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 fifth end e, so the third resistor R3 and the fourth resistor R4 are both connected to the first current-carrying line; then, the second current-carrying line is connected to the first current-carrying line through the first resistor R1, the second shielding conductor structure 120, the first shielding conductor structure 110 and the third resistor R3, and the second current-carrying line is connected to the first current-carrying line through the second resistor R2, the second shielding conductor structure 120, the first shielding conductor structure 110 and the fourth resistor R4.

[0094] It can be seen that when the first shielding conductor structure and / or the second shielding conductor structure is open-circuited, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 cooperate to generate an open-circuit signal to achieve open-circuit detection, specifically:

[0095] 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 first resistor R1, the first end a, the third end c, the sixth end f, the fourth end d, and the third resistor R3 form a current path, and the current in the first resistor R1 and the third resistor R3 changes, that is, the first resistor R1 cooperates with the third resistor R3 to generate a first open-circuit signal corresponding to the current change, thereby triggering the driving module 330. At the same time, the second current-carrying line, the second resistor R2, the second end b, the third end c, the sixth end f, the fourth end d, and the third resistor R3 form a current path, and the current in the second resistor R2 and the third resistor R3 changes, that is, the second resistor R2 cooperates with the third resistor R3 to generate a second open-circuit signal corresponding to the current change, thereby triggering the driving module 330.

[0096] 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 second resistor R2, the second end b, the third end c, the sixth end f, the fifth end e, and the fourth resistor R4 form a current path, and the current in the second resistor R2 and the fourth resistor R4 changes, that is, the second resistor R2 cooperates with the fourth resistor R4 to generate a second open-circuit signal corresponding to the current change, thereby triggering the driving module 330. At the same time, the second current-carrying line, the first resistor R1, the first end a, the third end c, the sixth end f, the fifth end e, and the fourth resistor R4 form a current path, and the current in the first resistor R1 and the fourth resistor R4 changes, that is, the first resistor R1 cooperates with the fourth resistor R4 to generate a first open-circuit signal corresponding to the current change, thereby triggering the driving module 330.

[0097] When the first shielding conductor structure 110 between the first end a and the third end c is open-circuited, that is, the connection between the first resistor R1 and the first end a is open-circuited, the voltage of the first resistor R1 increases, thereby generating a first open-circuit signal to the driving module 330, thereby triggering the driving module 330;

[0098] When the first shielding conductor structure 110 between the second end b and the third end c is open-circuited, that is, the connection between the second resistor R2 and the second end b is open-circuited, the voltage of the second resistor R2 increases, thereby generating a second open-circuit signal to the driving module 330, thereby triggering the driving module 330;

[0099] When the connection between the third end c and the sixth end f is open, that is, the connection between the first resistor R1 and the first end a is open, and the connection between the second resistor R2 and the second end b is open, the voltage of the first resistor R1 increases, thereby generating a first open-circuit signal to trigger the driving module 330, and the voltage of the second resistor R2 increases, thereby generating a second open-circuit signal to trigger the driving module 330.

[0100] As shown in Figure 2, in some embodiments, the driving module 330 includes a fifth impedance element, a sixth impedance element, a first Zener diode ZD1 and a second Zener diode ZD2, one end of the fifth impedance element is connected to the connection point between the third impedance element and the fourth impedance element, the other end of the fifth impedance element is connected to the positive electrode of the first Zener diode ZD1 and the positive electrode of the second Zener diode ZD2 through the sixth impedance element, the negative electrode of the first Zener diode ZD1 is connected to the connection point between the first impedance element and the first end a, and the negative electrode of the second Zener diode ZD2 is connected to the connection point between the second impedance element and the second end b.

[0101] For convenience of explanation, in this embodiment, the fifth impedance element is represented as the fifth resistor R5 in Figure 2, and the sixth impedance element is represented as the sixth resistor R6 in Figure 2; it can be understood that 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 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.

[0102] The fifth resistor R5 is connected to the first current-carrying line and to the connection point of the third resistor R3 and the fourth resistor R4, while the first Zener diode ZD1 is connected to the connection point of the first resistor R1 and the first end a, and the second Zener diode ZD2 is connected to the connection point of the second resistor R2 and the second end b. Thus, the second current-carrying line connects the first resistor R1 and the second resistor R2, respectively, and then passes through the first shielded conductor structure 110 and the second shielded conductor structure 120, as well as through the third resistor R3 and the fourth resistor R4, to the first current-carrying line. If leakage current occurs in the first shielded conductor structure 110 and / or the second shielded conductor structure 120, the leakage current can be directly conducted to the driver module 330. In this case, the driver module 330 receives the first open-circuit signal through the first Zener diode ZD1 and can also receive the leakage signal directly from the first shielded conductor structure 110 and / or the second shielded conductor structure 120. The driver module 330 also receives the second open-circuit signal through the second Zener diode ZD2 and can also receive the leakage signal from the first shielded conductor structure 110 and / or the second shielded conductor structure 120.

[0103] It is understandable that, when no leakage current or open circuit occurs in the first shielded conductor structure 110 and the second shielded conductor structure 120, in the impedance network formed by the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4, the voltage at the connection point between the first resistor R1 and the first end a does not exceed the breakdown voltage of the first Zener diode ZD1, and the voltage at the connection point between the second resistor R2 and the second end b does not exceed the breakdown voltage of the second Zener diode ZD2. In this case, the detection and protection device 300 does not affect the normal operation of the power cord 100. When leakage current occurs in the impedance network, or an open circuit occurs in the first shielded conductor structure 110 and / or the second shielded conductor structure 120, the voltage on the impedance network changes accordingly, causing the first Zener diode ZD1 and / or the second Zener diode ZD2 to break down, thereby triggering the driver module 330 to control the switch module 200 to disconnect the power connection of the power cord 100. This process will be described in detail later.

[0104] As shown in Figure 2, in some embodiments, the detection and protection device 300 also includes a switch tripping drive unit 340, which 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 end and the output end of the power line 100.

[0105] 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 340 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 directly controlled by the drive module 330 or indirectly, for example, by triggering the switch unit to turn on via a control chip, trigger circuit, etc. when the drive module 330 receives a first open circuit signal, a second open circuit signal, or a leakage signal. The switch unit can be a conventional contact switch or a semiconductor device such as a transistor or MOS transistor, and is not limited here.

[0106] 2 , in some embodiments, the switch unit includes a first switch tube Q1 , and a connection point between the fifth impedance element and the sixth impedance element is connected to a control pin of the first switch tube Q1 .

[0107] This embodiment uses a driver module 330 to directly control the conduction of the switch unit, and configures the driver module 330 with a first switch transistor Q1. In the driver module 330, 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 transistor Q1. When the driver module 330 receives a first open-circuit signal, a second open-circuit signal, or a leakage signal, causing the voltage at the connection point between the fifth resistor R5 and the sixth resistor R6 to increase, the first switch transistor Q1 is turned on, thereby controlling the switch module 200 to be turned off.

[0108] As shown in Figure 2, in some embodiments, the switch trip drive unit 340 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, and one switch pin of the first switch tube Q1 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 and the other switch pin of the first switch tube Q1 are both connected to one end of the coil Lx, and the other end of the coil Lx is connected to the second current-carrying line.

[0109] The first switching tube Q1 is connected between the first current-carrying line and the second current-carrying line. The first diode D1 limits the current so that it can only flow from the second current-carrying line to the first current-carrying line through the first switching tube Q1 when the first switching tube Q1 is turned on. When the first voltage-stabilizing diode ZD1 is broken down, the second current-carrying line, the coil Lx, the first resistor R1, the first voltage-stabilizing diode ZD1, the sixth resistor R6, the fifth resistor R5, the first diode D1, and the first current-carrying line form a path. When the second voltage-stabilizing diode ZD2 is broken down, the second current-carrying line, the coil Lx, the second resistor R2, the second voltage-stabilizing diode ZD2, the sixth resistor R6, the fifth resistor R5, the first diode D1, and the first current-carrying line form a path.

[0110] It is understandable that when the voltage on the first current-carrying line and / or the second current-carrying line fluctuates, the voltage on the first shielded conductor structure 110 and the second shielded conductor structure 120 increases, thereby increasing the voltage applied to the cathode of the first Zener diode ZD1 and the cathode of the second Zener diode ZD2. If the voltage exceeds the breakdown voltage of the first Zener diode ZD1 or the second Zener diode ZD2, the first switch Q1 can be triggered to turn on, triggering the switch trip drive unit 340 to control the switch module 200 to disconnect the power connection between the input and output ends of the power cord 100. Therefore, the detection and protection device of the embodiment of the present application is not only suitable for triggering tripping when the shielding layer is open-circuited and leakage current occurs, but also suitable for triggering tripping when the current-carrying line experiences voltage fluctuations, thereby realizing the overvoltage protection function of the current-carrying line.

[0111] As shown in FIG2 , in some embodiments, the detection and protection device 300 further includes a test module configured to short-circuit the first detection module 310 and / or the second detection module 320 upon being triggered. The test module provides a test function to the user, such that, upon activation of the test module, if the LCDI device is able to disconnect the power connection between the power cord 100, it indicates that the LCDI device is functioning normally. The test module of this embodiment is electrically connected to the first detection module 310 and the second detection module 320, such that upon activation of the test module, the first detection module 310 and / or the second detection module 320 can be short-circuited. When the test module causes the first detection module 310 to be short-circuited, the second current-carrying line passes through the coil Lx and the branch where the test module is located and is directly connected to the third end c. Since the second detection module 320 is also connected to the third end c, the second detection module 320 is also short-circuited, causing the voltage of the cathode of the first Zener diode ZD1 and the cathode of the second Zener diode ZD2 to rise, and the first Zener diode ZD1 and the second Zener diode ZD2 to be broken down, and then the first switch tube Q1 is turned on, and 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 disconnect. Similarly, when the test module causes the second detection module 320 to be short-circuited, the second streamline passes through the coil Lx and the branch where the test module is located and is directly connected to the third end c. Since the first detection module 310 is also connected to the third end c, the first detection module 310 is also short-circuited, causing the voltage of the cathode of the first Zener diode ZD1 and the cathode of the second Zener diode ZD2 to rise, and the first Zener diode ZD1 and the second Zener diode ZD2 are broken down, and then the first switch tube Q1 is turned on, and 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 disconnect.

[0112] Specifically, the test module includes a test switch TEST, a first impedance element and a second impedance element connected to the second current-carrying line through a coil Lx;

[0113] The test switch TEST is connected in parallel with the first impedance element or the second impedance element;

[0114] Alternatively, one end of the test switch TEST is connected to the connection point of the first impedance element and the second impedance element, and the other end is connected to the first shielding conductor structure 110 or the second shielding conductor structure 120 .

[0115] The test switch TEST is connected in parallel with the first resistor R1 or the second resistor R2. When the test switch TEST is closed, the first resistor R1 or the second resistor R2 is short-circuited. According to the above analysis, the short-circuit between the second resistor R2 and the first resistor R1 can trigger the breakdown of the first and second Zener diodes ZD1 and ZD2, thereby turning on the first switch Q1, and ultimately causing the coil Lx to generate an electromagnetic force to control the switch module 200 to open. In Figure 2, the test switch TEST is connected in parallel with the first resistor R1. 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 at the cathode of the first and second Zener diodes ZD1 and ZD2 to rise. The first and second Zener diodes ZD1 and ZD2 break down, thereby turning on the first switch Q1. 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 to cause the coil Lx to generate a sufficient electromagnetic force to control the switch module 200 to open.

[0116] In addition, one end of the test switch TEST can be set at the connection point between the first resistor R1 and the second resistor R2, and the other end can be connected to the first shielded conductor structure 110 or the second shielded conductor structure 120. Since the first resistor R1 and the second resistor R2 are both connected to the third end c, this configuration of the test switch TEST is actually connected in parallel with the first resistor R1 and the second resistor R2. Because the points on the first shielded conductor structure 110 and the second shielded conductor structure 120 are at the same potential, when the test switch TEST is closed, the first resistor R1 and the second resistor R2 are actually short-circuited, which can also trigger the first Zener diode ZD1 and the second Zener diode ZD2 to break down, causing the coil Lx to generate a sufficiently large electromagnetic force to control the switch module 200 to disconnect.

[0117] 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 wire, and the other end of which is respectively connected to the second current-carrying wire and one end of the coil Lx. The lightning protection module 600 includes a first varistor ZR1 between the first and second current-carrying wires. When a sudden high current flows between the first and second current-carrying wires, 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 340. The second current-carrying wire, coil Lx, second varistor ZR2, first diode D1, and first current-carrying wire are sequentially connected. The second varistor ZR2 is used to prevent sudden high currents in the switch trip drive unit 340 from shocking circuit components.

[0118] As shown in FIG2 , some embodiments further include an LED indicator unit 700 connected in parallel with the switch unit. The LED indicator unit 700 includes a seventh 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, then 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 seventh impedance element is shown in FIG2 as a series connection of a seventh resistor R7 and an eighth resistor R8. It will be understood that the seventh resistor R7 and the eighth resistor R8 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 and the eighth resistor R8 can also be other voltage-dropping elements or combinations thereof, such as inductors, capacitors, or any combination of capacitors, inductors, and resistors.

[0119] 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.

[0120] The following describes in detail the detection and protection device 300 according to an embodiment of the present application through a specific example.

[0121] Refer to the circuit diagram of the detection protection device 300 shown in FIG. 2 .

[0122] 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.

[0123] 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, and a fourth resistor R4, wherein one end of the first resistor R1 and one end of the second resistor R2 are both connected to the second current-carrying line via a coil Lx, the other end of the first resistor R1 is connected to the cathode of a first voltage-stabilizing diode ZD1 in the driving module 330, the other end of the first resistor R1 is also connected to the first end a, the other end of the second resistor R2 is connected to the cathode of a second voltage-stabilizing diode ZD2 in the driving module 330, and the other end of the second resistor R2 is also connected to the second end b; one end of the third resistor R3 and one end of the fourth resistor R4 are both connected to the first current-carrying line via a first diode D1, the other end of the third resistor R3 is connected to the fourth end d, and the other end of the fourth resistor R4 is connected to the fifth end e.

[0124] The driving module 330 includes a fifth resistor R5, a sixth resistor R6, a first Zener diode ZD1, and a second Zener diode ZD2. The fifth resistor R5 and the sixth resistor R6 are connected in series. The sixth resistor R6 is connected to the anode of the first Zener diode ZD1 and the anode of the second Zener diode ZD2, respectively. The cathode of the first Zener diode ZD1 is connected to the connection point between the first resistor R1 and the first end a. The cathode of the second Zener diode ZD2 is connected to the connection point between the second resistor R2 and the second end b. The fifth resistor R5 is connected to the connection point between the third resistor R3 and the fourth resistor R4. The connection point between the fifth resistor R5 and the sixth resistor R6 is used to output the control voltage to the switch trip driving unit 340.

[0125] The switch trip drive unit 340 includes a switch transistor Q1, whose control pin is connected to the connection point between the fifth resistor R5 and the sixth resistor R6. One switch pin of the first switch transistor Q1 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.

[0126] The detection and protection device 300 further includes a test switch TEST, which is connected in parallel with the first resistor R1.

[0127] 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.

[0128] 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:

[0129] The first current path is the second current-carrying line, the coil Lx, the first resistor R1, the first terminal a, the third terminal c, the sixth terminal f, the fourth terminal d, the third resistor R3, the first diode D1, and the first current-carrying line;

[0130] The second current path is the second current-carrying line, the coil Lx, the first resistor R1, the first terminal a, the third terminal c, the sixth terminal f, the fifth terminal e, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0131] The third current path is the second current-carrying line, the coil Lx, the second resistor R2, the second terminal b, the third terminal c, the sixth terminal f, the fifth terminal e, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0132] The fourth current path is the second current-carrying line, the coil Lx, the second resistor R2, the second terminal b, the third terminal c, the sixth terminal f, the fourth terminal d, the third resistor R3, the first diode D1, and the first current-carrying line;

[0133] Since the impedance network formed by the first resistor R1, the second resistor R2, 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, and the voltage at the connection point between the first resistor R1 and the first end a does not exceed the breakdown voltage of the first Zener diode ZD1, and the voltage at the connection point between the second resistor R2 and the second end b does not exceed the breakdown voltage of the second Zener diode ZD2.

[0134] 4 , 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 first end a increases, exceeding the breakdown voltage of the first Zener diode ZD1 . The voltage at the connection point between the second resistor R2 and the second end b increases, exceeding the breakdown voltage of the second Zener diode ZD2 . This simultaneously forms two current paths ① and ②:

[0135] Current path ①: second current-carrying line, coil Lx, first resistor R1, first Zener diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0136] Current path ②: second current-carrying line, coil Lx, second resistor R2, second Zener diode ZD2, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0137] The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 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.

[0138] 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.

[0139] 1. As shown in FIG5 , when the second shielding conductor structure 120 between the fourth end d and the sixth end f is open-circuited, two current paths are formed at the same time:

[0140] The first current path is the second current-carrying line, the coil Lx, the first resistor R1, the first terminal a, the third terminal c, the sixth terminal f, the fifth terminal e, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0141] The second current path is the second current-carrying line, the coil Lx, the second resistor R2, the second terminal b, the third terminal c, the sixth terminal f, the fifth terminal e, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0142] At this point, the connection between the third resistor R3 and the fourth terminal d in the impedance network is in an open circuit state, causing the voltage at the connection point between the first resistor R1 and the first terminal a to rise, exceeding the breakdown voltage of the first Zener diode ZD1. The voltage at the connection point between the second resistor R2 and the second terminal b to rise, exceeding the breakdown voltage of the second Zener diode ZD2, thereby forming two current paths ① and ② simultaneously:

[0143] Current path ①: second current-carrying line, coil Lx, first resistor R1, first Zener diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0144] Current path ②: second current-carrying line, coil Lx, second resistor R2, second Zener diode ZD2, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0145] The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 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.

[0146] 2. As shown in FIG6 , when the second shielding conductor structure 120 between the sixth end f and the fifth end e is open-circuited, two current paths are formed simultaneously:

[0147] The first current path is the second current-carrying line, the coil Lx, the first resistor R1, the first terminal a, the third terminal c, the sixth terminal f, the fourth terminal d, the third resistor R3, the first diode D1, and the first current-carrying line;

[0148] The second current path is the second current-carrying line, the coil Lx, the second resistor R2, the second terminal b, the third terminal c, the sixth terminal f, the fourth terminal d, the third resistor R3, the first diode D1, and the first current-carrying line;

[0149] At this point, the connection between the fourth resistor R4 and the fifth terminal e in the impedance network is in an open circuit state, causing the voltage at the connection point between the first resistor R1 and the first terminal a to rise, exceeding the breakdown voltage of the first Zener diode ZD1. The voltage at the connection point between the second resistor R2 and the second terminal b to rise, exceeding the breakdown voltage of the second Zener diode ZD2, thereby forming two current paths ① and ② simultaneously:

[0150] Current path ①: second current-carrying line, coil Lx, first resistor R1, first Zener diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0151] Current path ②: second current-carrying line, coil Lx, second resistor R2, second Zener diode ZD2, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0152] The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 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.

[0153] 3. As shown in FIG. 7 , when the first shielding conductor structure 110 between the first end a and the third end c is open-circuited, two current paths are formed simultaneously:

[0154] The first current path is the second current-carrying line, the coil Lx, the second resistor R2, the second terminal b, the third terminal c, the sixth terminal f, the fourth terminal d, the third resistor R3, the first diode D1, and the first current-carrying line;

[0155] The first current path is the second current-carrying line, the coil Lx, the second resistor R2, the second terminal b, the third terminal c, the sixth terminal f, the fifth terminal e, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0156] At this point, the connection between the first resistor R1 and the first end a in the impedance network is in an open circuit state. The voltage of the second current-carrying line is applied to the cathode of the first Zener diode ZD1 via the coil Lx, exceeding the breakdown voltage of the first Zener diode ZD1. This forms a current path ①: the second current-carrying line, the coil Lx, the first resistor R1, the first Zener diode ZD1, the sixth resistor R6, the fifth resistor R5, the first diode D1, and the first current-carrying line. The voltage at the connection point between the fifth resistor R5 and the sixth resistor R6 increases, triggering the first switch Q1 to turn on. At this time, the second current-carrying line 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 large enough to generate sufficient electromagnetic force to control the switch module 200 to turn off.

[0157] 4. As shown in FIG8 , when the first shielding conductor structure 110 between the third end c and the second end b is open-circuited, two current paths are formed simultaneously:

[0158] The first current path is the second current-carrying line, the coil Lx, the first resistor R1, the first terminal a, the third terminal c, the sixth terminal f, the fourth terminal d, the third resistor R3, the first diode D1, and the first current-carrying line;

[0159] The second current path is the second current-carrying line, the coil Lx, the first resistor R1, the first terminal a, the third terminal c, the sixth terminal f, the fifth terminal e, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0160] At this point, the connection between the second resistor R2 and the second end b in the impedance network is in an open circuit state. The voltage of the second current-carrying line is applied to the cathode of the second Zener diode ZD2 via the coil Lx, exceeding the breakdown voltage of the second Zener diode ZD2, thereby forming a current path ②: the second current-carrying line, the coil Lx, the second resistor R2, the second Zener diode ZD2, the sixth resistor R6, the fifth resistor R5, the first diode D1, and the first current-carrying line. The voltage at the connection point between the fifth resistor R5 and the sixth resistor R6 increases, triggering the first switch Q1 to turn on. At this time, the second current-carrying line 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 large enough to generate sufficient electromagnetic force to control the switch module 200 to turn off.

[0161] 5. As shown in FIG9 , when the connection between the third terminal c and the sixth terminal f is open, it is equivalent to the connection between the first resistor R1 and the first terminal a, and the connection between the second resistor R2 and the second terminal b in the impedance network are both in an open circuit state. The voltage of the second current-carrying line is applied to the cathode of the first Zener diode ZD1 via the coil Lx, exceeding the breakdown voltage of the first Zener diode ZD1. The voltage of the second current-carrying line is applied to the cathode of the second Zener diode ZD2 via the coil Lx, exceeding the breakdown voltage of the second Zener diode ZD2. Simultaneously, two current paths ① and ② are formed:

[0162] Current path ①: second current-carrying line, coil Lx, first resistor R1, first Zener diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0163] Current path ②: second current-carrying line, coil Lx, second resistor R2, second Zener diode ZD2, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0164] The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 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.

[0165] 10 , when the test switch TEST is closed, two current paths are formed simultaneously:

[0166] The first current path is the second current-carrying line, the coil Lx, the test switch TEST, the first terminal a, the third terminal c, the sixth terminal f, the fourth terminal d, the third resistor R3, the first diode D1, and the first current-carrying line;

[0167] The second current path is the second current-carrying line, the coil Lx, the test switch TEST, the first terminal a, the third terminal c, the sixth terminal f, the fifth terminal e, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0168] The test switch TEST short-circuits the first resistor R1 and the second resistor R2 in the impedance network. The voltage of the second current-carrying line is applied to the cathode of the first Zener diode ZD1 via the coil Lx, exceeding the breakdown voltage of the first Zener diode ZD1. The voltage of the second current-carrying line is applied to the cathode of the second Zener diode ZD2 via the coil Lx, exceeding the breakdown voltage of the second Zener diode ZD2. Thus, two current paths ① and ② are formed simultaneously:

[0169] Current path ①: second current-carrying line, coil Lx, first resistor R1, first Zener diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0170] Current path ②: second current-carrying line, coil Lx, second resistor R2, second Zener diode ZD2, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0171] The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 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.

[0172] 11 , a second embodiment 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 .

[0173] 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.

[0174] 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, 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, any of the above conductor structures 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 detection module can generate a first open circuit signal, and the second detection module can generate a second open circuit signal. When the driving module 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 the above manner, 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 corresponding open circuit signal can be used to trigger the disconnection of the power connection of the power line, thereby ensuring power safety.

[0175] 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 first detection module, configured to generate a first open circuit signal when the first shielding conductor structure and / or the second shielding conductor structure is open circuited; a second detection module, 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 driving module 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 the first open circuit signal, the second open circuit signal, or the leakage signal of the first shielded conductor structure or the second shielded conductor structure is detected.

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

3. The detection and protection device according to claim 1 or 2, wherein: The first detection module includes a first impedance element, the first end is connected to the second current-carrying line through the first impedance element, the second detection module includes a second impedance element, the second end is connected to the second current-carrying line through the second impedance element, the first connection end of the driving module is connected to the connection point between the first impedance element and the first end, the second connection end of the driving module is connected to the connection point between the second impedance element and the second end, and the third connection end of the driving module is connected to the first current-carrying line.

4. The detection protection device according to claim 3, further comprising a third impedance element and a fourth impedance element, wherein the fourth end is connected to the first current-carrying line through the third impedance element, and the fifth end is connected to the first current-carrying line through the fourth impedance element; In the case where an open circuit occurs in the second shielded conductor structure between the fourth end and the sixth end, the first impedance element is configured to cooperate with the fourth impedance element to generate the first open circuit signal, and the second impedance element is configured to cooperate with the fourth impedance element to generate the second open circuit signal; In the case where an open circuit occurs in the second shielded conductor structure between the fifth end and the sixth end, the first impedance element is configured to cooperate with the third impedance element to generate the first open circuit signal, and the second impedance element is configured to cooperate with the third impedance element to generate the second open circuit signal; In the case that an open circuit occurs in the first shielded conductor structure between the first end and the third end, the first impedance element is configured to generate the first open circuit signal; In the case that the first shielded conductor structure between the second end and the third end is open-circuited, the second impedance element is configured to generate the second open-circuit signal; as well as When an open circuit occurs at the connection between the third terminal and the sixth terminal, the first impedance element is configured to generate the first open circuit signal, and the second impedance element is configured to generate the second open circuit signal.

5. The detection and protection device according to claim 4, wherein: The driving module includes a fifth impedance element, a sixth impedance element, a first Zener diode and a second Zener diode, one end of the fifth impedance element is connected to the connection point between the third impedance element and the fourth impedance element, the other end of the fifth impedance element is connected to the anode of the first Zener diode and the anode of the second Zener diode through the sixth impedance element, the cathode of the first Zener diode is connected to the connection point between the first impedance element and the first end, and the cathode of the second Zener diode is connected to the connection point between the second impedance element and the second end.

6. The detection and protection device according to claim 5 further includes a switch tripping drive unit, wherein the switch tripping drive unit includes a switch unit and a coil for generating an electromagnetic force to drive the switch module, and 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.

7. The detection and protection device according to claim 6, wherein: The switch unit includes a first switch tube, and a connection point between the fifth impedance element and the sixth impedance element is connected to a control pin of the first 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, and a switch pin of the first 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 and the other switch pin of the first switch tube are both 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 6 , further comprising a test module, wherein the test module is configured to short-circuit the first detection module and / or the second detection module after being triggered.

10. The detection and protection device according to claim 9, wherein: The test module includes a test switch, the first impedance element and the second impedance element are connected to the second current-carrying line through the coil; The test switch is connected in parallel with the first impedance element or the second impedance element; Alternatively, one end of the test switch is connected to a connection point between the first impedance element and the second impedance element, and the other end is connected to the first shielding conductor structure or the second shielding conductor structure.

11. The detection and protection device according to any one of claims 6 to 10, 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. 12 . The detection and protection device according to claim 6 , further comprising an LED indication unit connected in parallel with the switch unit, wherein the LED indication unit comprises a seventh impedance element and a light emitting diode connected in series.

13. An electrical connection device, comprising a housing, a power cord and the detection and protection device according to any one of claims 1 to 12, wherein: The power line is connected to the detection and protection device, and the detection and protection device is arranged inside the shell.

14. An electrical device, comprising a load device and the electrical connection device according to claim 13, wherein the output end of the power line is connected to the load device.

Images