Detection protection device of power line, electric connection equipment and electric equipment

Abstract

The invention discloses a detection protection device of a power line, electric connection equipment and electric equipment, and is characterized in that a first shielding conductor structure and a second shielding conductor structure are arranged in the power line, and under the condition that the first shielding conductor structure and / or the second shielding conductor structure are / is open-circuited, a first impedance element can generate a first open-circuit signal; the first impedance element can generate a first open-circuit signal, the second impedance element can generate a second open-circuit signal, and the switch tripping driving unit can control the switch module to disconnect the power connection between the input end and the output end of the power line when detecting the first open-circuit signal, the second open-circuit signal or the electric leakage signal. When the integrity of the first shielding conductor structure and / or the second shielding conductor structure is damaged, namely, an open circuit occurs, the power connection of the power line can be triggered and disconnected through the corresponding open circuit signal, so that the power utilization safety is ensured.

Description

[0001] This application claims priority to four Chinese patent applications filed on August 31, 2023: application number "202311122754X", application name "power cord, detection and protection device of power cord, electrical connection equipment and electrical equipment", application number "2023223725448", application name "power cord, detection and protection device of power cord, electrical connection equipment and electrical equipment", application number "2023111227709", application name "detection and protection device of power cord, electrical connection equipment and electrical equipment" and application number "2023223725700", application name "detection and protection device of power cord, electrical connection equipment and electrical equipment", all of which are incorporated by reference in this application. Technical Field

[0002] 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

[0003] A leakage circuit breaker (LCDI) is a power connection device for electrical appliances. It can detect the leakage current of a 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 to ensure safe use.

[0004] In the existing leakage current detection circuit breaker, when the leakage current detection line of the live wire or the neutral wire in the power cord is broken, the appliance can still output power. At this time, the appliance may have a safety hazard in electricity use, but the leakage current detection circuit breaker of the related technology cannot reflect the integrity of the leakage current detection line. Summary of the invention

[0005] The embodiments of the present application provide a detection and protection device for a power line, an electrical connection device, and an electrical device, which can cut off the power connection between the input end and the output end of the power line when a leakage signal or an open circuit signal is detected.

[0006] In a first aspect, an embodiment of the present application provides 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 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 comprises a first end close to an input end of the power line, a second end close to an output end of the power line, and a third end between the first end and the second end, the second shielding conductor structure comprises a fourth end close to an input end of the power line, a fifth end close to an output end of the power line, and a sixth end between the fourth end and the fifth end; the third end and the sixth end are connected;

[0007] The detection and protection device comprises:

[0008] A switch module, used to control the power connection between the input end and the output end of the power line;

[0009] 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;

[0010] 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;

[0011] 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.

[0012] 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 positions:

[0013] a first shielding conductor structure between the first end and the third end;

[0014] a second shielding conductor structure between the fourth end and the sixth end;

[0015] a connection between the third end and the sixth end;

[0016] 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:

[0017] a first shielding conductor structure between the second end and the third end;

[0018] a second shielding conductor structure between the fifth end and the sixth end;

[0019] A connection between the third end and the sixth end.

[0020] 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;

[0021] 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.

[0022] 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.

[0023] 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 and output ends of the power line.

[0024] 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.

[0025] 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.

[0026] In some embodiments, 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.

[0027] In some embodiments, a first capacitor and a second capacitor are also included, 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.

[0028] In some embodiments, the detection 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.

[0029] 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;

[0030] 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.

[0031] 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.

[0032] In some embodiments, an LED indication unit connected in parallel with the switch unit is further included, and the LED indication unit includes an eighth impedance element and a light emitting diode connected in series.

[0033] In a second aspect, an embodiment of the present application provides an electrical connection device, comprising a shell, 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 shell.

[0034] 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.

[0035] The detection and protection device, electrical connection device and electrical equipment of the power line 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 impedance element can generate a first open-circuit signal, and the second impedance element can generate a second open-circuit signal, and the switch tripping drive unit can control the switch module to disconnect the power connection between the input end and the output end of the power line when detecting the first open-circuit signal, the second open-circuit signal or the leakage signal. 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 power connection of the power line can be disconnected by triggering the corresponding open-circuit signal, thereby ensuring power safety.

[0036] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or 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

[0037] Figure 1 It is a schematic diagram of module connection of the detection and protection device provided in an embodiment of the present application;

[0038] Figure 2 is a circuit diagram of a detection and protection device provided in an embodiment of the present application;

[0039] Figure 3 It is a schematic diagram of the current flow direction of the detection and protection device provided in an embodiment of the present application under normal working conditions;

[0040] Figure 4 and Figure 5 It is a schematic diagram of current flow direction 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;

[0041] Figure 6 It is a schematic diagram of current flow direction when an open circuit occurs in the first shielding conductor structure from the first end to the third end provided in an embodiment of the present application;

[0042] Figure 7 It is a schematic diagram of current flow direction when an open circuit occurs in the first shielding conductor structure from the third end to the second end provided in an embodiment of the present application;

[0043] Figure 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 in an embodiment of the present application;

[0044] Fig. 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 in an embodiment of the present application;

[0045] Fig.10 is a schematic diagram of an open circuit in the connection from the third terminal to the sixth terminal provided in an embodiment of the present application;

[0046] Fig.11 is a schematic diagram of current flow after the test switch TEST provided in an embodiment of the present application is closed;

[0047] Fig.12 It is a schematic diagram of current flow when the test switch provided in an embodiment of the present application is closed. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with 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 characteristics, operations or features 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 replaced or adjusted in order in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the accompanying drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0049] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0050] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0051] The leakage current detection circuit breaker, or LCDI, uses a shielded wire to cover the live wire or the neutral wire, and detects the leakage current on the live wire or the neutral wire through the shielded wire; if the live wire or the neutral wire is damaged and leakage current is transmitted to the shielded wire, the leakage current detection circuit breaker can trigger the disconnection of the power connection of the power cord. The current LCDIs are all designed for leakage current detection. By designing the corresponding circuit to connect to the shielding layer, the leakage signal can be detected from the shielding layer, thereby triggering the disconnection of the power connection of the power cord; however, in the case of an open circuit in the shielding wire, the leakage current cannot be detected, so it will not trigger the disconnection of the power connection of the power cord, and there will be no fault prompt, which poses a hidden danger to the safety of electrical appliances.

[0052] Based on this, the 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 wraps 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, and 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, which are respectively used to detect the open circuit of the first shielded conductor structure and / or the second shielded conductor structure, and generate a first open circuit signal and a second open circuit signal when an open circuit occurs. 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, and disconnect the power connection of the power line when an open circuit occurs in the shielding layer, thereby ensuring the safety of electricity use.

[0053] The following is an explanation of the power line detection and protection device, the electrical connection equipment and the electrical equipment with reference to the accompanying drawings.

[0054] Reference Figure 1 As shown, 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 close to the input end of the power line 100, a second end b close to 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 close to the input end of the power line 100, a fifth end e close to 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 is connected to the sixth end f;

[0055] The detection and protection device 300 comprises:

[0056] The switch module 200 is used to control the power connection between the input end and the output end of the power line 100;

[0057] A driving module, comprising 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;

[0058] The first impedance element 310 is configured to generate a first open circuit signal when the first shielded conductor structure 110 and / or the second shielded conductor structure 120 is open circuited; the second impedance element 320 is configured to generate a second open circuit signal when the first shielded conductor structure 110 and / or the second shielded conductor structure 120 is open circuited;

[0059] The trip switch driving unit 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 receiving the first open circuit signal or the second open circuit signal, or detecting a leakage signal of the first shielded conductor structure 110 or the second shielded conductor structure 120 .

[0060] A power line 100 is connected between the electrical connection device and the load device, and 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 skin of the first current-carrying line is provided between the first current-carrying line and the first shielded conductor structure 110, and an insulation skin of the second current-carrying line is provided between the second current-carrying line and the second shielded conductor structure 120. The situation where leakage current occurs is that after the insulation skin on the surface of the first current-carrying line is damaged, when the first current-carrying line contacts the first shielded conductor structure 110 so that the first shielded conductor structure 110 has leakage current, 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 skin on the surface of the second current-carrying line is damaged, when the second current-carrying line contacts the second shielded conductor structure 120 so that the second shielded conductor structure 120 has leakage current, 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.

[0061] 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 through the first wire 410, the second end b can be connected to the second impedance element 330 of the detection and protection device 300 through the 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 through the second wire 420, and the fifth end e can be connected to the second impedance element 330 of the detection and protection device 300 through the 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, so as to detect the leakage signal and the open circuit of the first shielded conductor structure 110 and the second shielded conductor structure 120.

[0062] Specifically, 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, any of the above conductor structures can be used to detect an open circuit. Therefore, the first impedance element 310 is also configured to generate a first open circuit signal when an open circuit occurs at at least one of the following positions:

[0063] A first shielding conductor structure 110 between the first end a and the third end c;

[0064] a second shielding conductor structure 120 between the fourth end d and the sixth end f;

[0065] A connection between the third terminal c and the sixth terminal f;

[0066] 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 drive 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 first open circuit signal.

[0067] 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 positions:

[0068] A first shielding conductor structure 110 between the second end b and the third end c;

[0069] a second shielding conductor structure 120 between the fifth end e and the sixth end f;

[0070] A connection between the third terminal c and the sixth terminal f.

[0071] 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 drive 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.

[0072] 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, no matter whether the power cord 100 has 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.

[0073] The specific circuit structure of the detection and protection device 300 is described below by way of example.

[0074] For the convenience of explanation, in this embodiment, the first impedance element 310 is Figure 2 The first resistor R1 is represented in FIG. Figure 2 It is represented as the second resistor R2; it can be understood that the first resistor R1 and the second resistor R2 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 first resistor R1 and the second resistor R2 can also be other voltage drop elements and combinations thereof, such as inductance, capacitance, or any combination of capacitance, inductance and resistance.

[0075] 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 the 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 the change corresponds to the second open-circuit signal, thereby triggering the switch tripping drive unit 330.

[0076] Reference Figure 2 As shown, 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 connected in series to form a second series branch;

[0077] 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.

[0078] For the convenience of explanation, the third impedance element in this embodiment is Figure 2 The third resistor R3 is represented in Figure 2 The fourth resistor R4 is represented in Figure 2 The fifth resistor R5 is represented in FIG. Figure 2 denoted by the sixth resistor R6; it can be understood that the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 may be single resistor elements, or may be resistor networks consisting of a plurality of resistors connected in series, in parallel or in series and in parallel, and the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 may also be other voltage drop elements and combinations thereof, such as inductors, capacitors or any combination of capacitors, inductors and resistors.

[0079] 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, so 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, so the fifth resistor R5 and the sixth resistor R6 are both connected to the second current-carrying line. It can be seen 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, but since the third end c and the sixth end f are connected, when there is no open circuit between the first shielding conductor structure 110 and the second shielding conductor structure 120, the second resistor R2 is short-circuited. 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.

[0080] It can be seen that when the first shielding conductor structure and / or the second shielding conductor structure is open-circuited, the current situation 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:

[0081] 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, and 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, and 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, and 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 on the first series branch and the second series branch changes, thereby triggering the switch tripping drive unit 330.

[0082] 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, and 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, and 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, and 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 on the first series branch and the second series branch changes, thereby triggering the switch tripping drive unit 330.

[0083] 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, and 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, and 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, and 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 on 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 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, and 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, and 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, and 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 on the first series branch and the second series branch changes, thereby triggering the switch tripping drive unit 330.

[0085] When the connection between the third end c and the sixth end 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, and 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 tripping drive unit 330.

[0086] Reference Figure 2 As shown, 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.

[0087] For the convenience of explanation, the seventh impedance element in this embodiment is Figure 2 It is represented as the seventh resistor R7; 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.

[0088] from Figure 2 It can be seen that the fifth resistor R5 and the sixth resistor R6 are connected in parallel and then connected in series with the seventh resistor R7, and the seventh resistor R7 plays a voltage dividing role. At this time, 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 setting the resistance value of each resistor in the impedance network, it is possible to achieve stable operation when the first shielding conductor structure 110 and the second shielding conductor structure 120 are not open-circuited, and the trip switch driving unit 330 will not be triggered by mistake. The seventh resistor R7 can also be used to connect a test switch, and the test function of the LCDI device can be realized by short-circuiting the seventh resistor R7 through the test switch. This will be described in detail later.

[0089] Reference Figure 2 As shown, 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, and 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.

[0090] The second current-carrying line is connected to the first current-carrying line through the coil Lx and the switch unit. When the switch unit is turned on, the switch tripping driving unit 330 uses the electromagnetic force generated by the coil Lx to control the switch module 200 to disconnect, thereby disconnecting the power connection between the input end and the output end of the power line 100. The switch unit can be turned on by the first open circuit signal, the second open circuit signal or the leakage signal, or in an indirect manner, for example, when the switch tripping driving unit 330 receives the first open circuit signal, the second open circuit signal or the leakage signal, the switch unit is triggered to turn on by a control chip, a trigger circuit, etc. The switch unit can be a conventional contact switch, or a semiconductor device such as a triode or a MOS tube, which is not limited here.

[0091] Reference Figure 2 As shown, 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 Lx.

[0092] 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.

[0093] Reference Figure 2 As shown, 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.

[0094] This embodiment adopts the method of directly controlling the switch unit by 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, and respectively configures the first switch tube Q1 and the second switch tube Q2, the first switch tube Q1 is triggered by the voltage at the dividing point between the first resistor R1 and the fifth resistor R5, and the second switch tube Q2 is triggered by the voltage at the dividing point between the second resistor R2 and the sixth resistor R6. That is to say, the voltage at the connection point between the fifth resistor R5 and the sixth resistor R6 is used to control the on and off of the first switch tube Q1, when the 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 tube Q1 can be 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 on and off of the second switch tube Q2, when the 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 tube Q2 can be turned on, thereby controlling the switch module 200 to be turned off.

[0095] Reference Figure 2 As shown, in some embodiments, the switch tripping drive unit 330 also includes a first diode D1 and a second diode D2; the anode of the first diode D1, the anode of the second diode D2, a switch pin of the first switch tube Q1, and a 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, another switch pin of the first switch tube Q1, and another 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.

[0096] 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 positive electrode of the first diode D1 and the coil Lx. The first diode D1 limits the current so that when the first switch tube Q1 is turned on, the current can only pass through the first switch tube Q1 from the second current-carrying line to the first current-carrying line, and also limits the current so that when the second switch tube Q2 is turned on, the current can only pass through the second switch tube Q2 from the second current-carrying line to the first current-carrying line. When the first open-circuit signal or the leakage signal increases the voltage at the connection point between the first resistor R1 and the fifth resistor R5, 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, and the current flowing through the coil Lx is large enough to disconnect the electromagnetic force generated by the coil Lx to control the switch module 200; when the second open-circuit signal or the leakage signal causes the voltage at the connection point of the second resistor R2 and the sixth resistor R6 to increase, the second switch tube Q2 is turned on, and 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, and the current flowing through the coil Lx is large enough to disconnect the electromagnetic force generated by the coil Lx to control the switch module 200.

[0097] Reference Figure 2 As shown, in some embodiments, a first capacitor C1 and a second capacitor C2 are also 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.

[0098] One end of the first capacitor C1 is connected to the first resistor R1, 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 of the impedance network changes, for example, the first open circuit signal or leakage signal causes the voltage at the connection point of the first resistor R1 and the fifth resistor R5 to increase, the first capacitor C1 is charged and the voltage of the control pin of the first switch tube Q1 is gradually increased, and then reaches the conduction voltage; when the second open circuit signal or leakage signal causes the voltage at the connection point of the second resistor R2 and the sixth resistor R6 to increase, the second capacitor C2 is charged and the voltage of the control pin of the second switch tube Q2 is gradually increased, and then reaches the conduction voltage. In addition, by setting the first capacitor C1 and the second capacitor C2, it is also possible to avoid large currents directly impacting the first switch tube Q1 and the second switch tube Q2.

[0099] Reference Figure 2As shown, in some embodiments, the detection protection device 300 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. The test module provides a test function to the user, and is used for, after the test module is activated, if the LCDI device can disconnect the power connection between the power lines 100, it indicates that the LCDI device is normal inside. The test module of this embodiment has a certain connection relationship with the fifth resistor R5, the sixth resistor R6, or the seventh resistor R7 in the circuit, so that the fifth resistor R5, the sixth resistor R6, or the seventh resistor R7 can be short-circuited after the test module is activated. When the test module causes the fifth resistor R5 to be short-circuited, the second current-carrying line is directly connected to the sixth terminal f after passing through the coil Lx, the seventh resistor R7 and the branch where the test module is located. 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 is applied to the control pin of the first switch tube Q1 and the control pin of the second switch tube Q2 after passing through the seventh resistor R7, so that the first switch tube Q1 and the second switch tube Q2 are 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 large enough electromagnetic force to control the switch module 200 to be disconnected. Similarly, when the test module causes the sixth resistor R6 to be short-circuited, the second current-carrying line is directly connected to the sixth terminal f after passing through the coil Lx, the seventh resistor R7 and the branch where the test module is located. 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 tube Q1 and the control pin of the second switch tube Q2 after passing through the seventh resistor R7, and then the first switch tube Q1 and the second switch tube Q2 are 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 large enough electromagnetic force to control the switch module 200 to be disconnected. When the test module causes the seventh resistor R7 to be short-circuited, the voltage division on the fifth resistor R5 and the sixth resistor R6 increases, so that the voltage on the control pin of the first switch tube Q1 and the control pin of the second switch tube Q2 increases, and then the first switch tube Q1 and the second switch tube Q2 are 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 large enough electromagnetic force to control the switch module 200 to be disconnected.

[0100] 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;

[0101] 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.

[0102] The test switch TEST is connected in parallel to 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. According to the above analysis, the sixth resistor R6 or the fifth resistor R5 is short-circuited, which can trigger the first switch tube Q1 and the second switch tube Q2 to turn on, and finally make the coil Lx generate electromagnetic force to control the switch module 200 to disconnect. Figure 2 In the embodiment, 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 where the test switch TEST is located, causing the voltage division on the fifth resistor R5 or the sixth resistor R6 to rise, and then the first switch tube Q1 and the second switch tube Q2 are 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.

[0103] In addition, one end of the test switch TEST can also be set at the connection point of the fifth resistor R5 and the sixth resistor R6, and the other end is connected to the connection point 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 setting of the test switch TEST is actually connected in parallel with the seventh resistor R7. When the test switch TEST is closed, the seventh resistor R7 is actually short-circuited, which can also trigger the first switch tube Q1 and the second switch tube Q2 to be turned on, so that the coil Lx generates a sufficiently large electromagnetic force to control the switch module 200 to disconnect.

[0104] Reference Figure 2 As shown, in some embodiments, a lightning protection module 600 is also included, one end of the lightning protection module 600 is connected to the first current-carrying line, and the other end is respectively connected to the second current-carrying line and one end of the coil Lx. The lightning protection module 600 sets a first varistor ZR1 between the first current-carrying line and the second current-carrying line. When a large instantaneous current appears between the first current-carrying line and the second current-carrying line, the resistance value of the first varistor ZR1 increases rapidly to protect the circuit from large current shocks. In addition, a second varistor ZR2 is also set in the switch tripping drive unit 330, and the second current-carrying line, the coil Lx, the second varistor ZR2, the first diode D1 and the first current-carrying line are connected in sequence. The second varistor ZR2 is used to prevent the switch tripping drive unit 330 from having a large instantaneous current and shocking the circuit elements.

[0105] Reference Figure 2As shown, in some embodiments, an LED indicating unit 700 connected in parallel with the switch unit is also included, and the LED indicating unit 700 includes an eighth impedance element and a light-emitting diode LED1 connected in series. One end of the LED indicating unit 700 is connected to the first current-carrying line through the first diode D1, and the other end is connected to the second current-carrying line through the coil Lx. When the circuit is working normally, the current of the second current-carrying line passes through the coil Lx to 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 to prompt the user of the current working status of the LCDI device. Among them, the eighth impedance element is connected in series. Figure 2 It is represented as a series connection of an eighth resistor R8 and a ninth resistor R9; it can be 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 drop elements and combinations thereof, such as inductors, capacitors, or any combination of capacitors, inductors and resistors.

[0106] 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 line 100 can be disconnected, thereby realizing the disconnection of the power connection of the power line 100 triggered by leakage current, and also realizing the disconnection of the power connection of the power line 100 triggered by the open circuit of the shielding line.

[0107] The detection protection device 300 of the embodiment of the present application is described in detail below through a specific example.

[0108] Reference Figure 2 The circuit diagram of the detection protection device 300 is shown.

[0109] 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.

[0110] The detection protection device 300 is connected to the first shielded conductor structure 110 and the second shielded conductor structure 120 to realize leakage detection and open circuit detection. Specifically, the detection 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 through 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 through the first diode D1, the connection point of the first resistor R1 and the third resistor R3 is connected to the first end a, the connection point of the first resistor R1 and the fifth resistor R5 is connected to the fourth end d, the connection point of the second resistor R2 and the fourth resistor R4 is connected to the second end b, and the connection point of the second resistor R2 and the sixth resistor R6 is connected to the fifth end e.

[0111] The switch tripping driving unit 330 includes a first switch tube Q1 and a second switch tube Q2, wherein a control pin of the first switch tube Q1 is connected to a connection point between the first resistor R1 and the fifth resistor R5, and a control pin of the second switch tube Q2 is connected to a connection point between the second resistor R2 and the sixth resistor R6. The first switch tube Q1 and the second switch tube Q2 are connected in parallel, and one switch pin of the first switch tube Q1 and the second switch tube Q2 is connected to a connection point between the third resistor R3 and the fourth resistor R4, and the other switch pin is connected to a connection point between the first resistor R1 and the second resistor R2.

[0112] The detection and protection device 300 further includes a test switch TEST, and the test switch TEST is connected in parallel with the seventh resistor R7.

[0113] 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.

[0114] Reference Figure 3 As shown, when there is no leakage current or open circuit in the first shielding conductor structure 110 and the second shielding conductor structure 120, the LCDI device works normally and forms four current paths:

[0115] The first current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth end d, the sixth end f, the third end c, the first end a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0116] 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 sixth end f, the third end c, the second end b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0117] 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;

[0118] 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;

[0119] Since the seventh resistor R7, the fifth resistor R5, the sixth resistor R6, the third resistor R3 and the fourth resistor R4 form an impedance network that 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 fifth resistor R5 cannot turn on the first switch tube Q1, and the voltage at the connection point between the second resistor R2 and the sixth resistor R6 cannot turn on the second switch tube Q2.

[0120] Reference Figure 4 As shown, when there is leakage current 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. According to the different positive voltages of the first current-carrying line and the second current-carrying line, multiple current paths are formed simultaneously:

[0121] When the first current-carrying line is at positive voltage:

[0122] The first current path: the first shielding conductor structure 110, the fifth resistor R5, the seventh resistor R7, the coil Lx, and the second current-carrying line;

[0123] The second current path: the first shielding conductor structure 110, the third resistor R3, the second diode D2, the coil Lx, and the second current-carrying line;

[0124] 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;

[0125] Fourth current path: the first shielding conductor structure 110, the fourth resistor R4, the second diode D2, the coil Lx, and the second current-carrying line;

[0126] When the second current-carrying line is at positive voltage:

[0127] The first current path: the second shielding conductor structure 120, the third resistor R3, the first diode D1, and the first current-carrying line;

[0128] The second current path: the second shielding conductor structure 120 , the fourth resistor R4 , the first diode D1 , and the first current-carrying line;

[0129] In both of the above situations, the voltage at the connection point of 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, and 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 of 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, and the current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to be disconnected.

[0130] 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.

[0131] 1.Reference Figure 5 As shown, 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 at the same time:

[0132] The first current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth end d, the sixth end f, the third end c, the second end b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0133] 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;

[0134] 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;

[0135] 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;

[0136] At this time, it is equivalent to the fifth resistor R5 and the sixth resistor R6 in the impedance network being connected in parallel, the first resistor R1 and the third resistor R3 being connected in series and then connected 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 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, and the current flowing through the coil Lx is large enough, thereby generating sufficient electromagnetic force to control the switch module 200 to disconnect; 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, and the current flowing through the coil Lx is large enough, thereby generating sufficient electromagnetic force to control the switch module 200 to disconnect. .

[0137] 2.Reference Figure 6 As shown, 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 at the same time:

[0138] The first current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth end d, the sixth end f, the third end c, the first end a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0139] 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 sixth end f, the fifth end e, the second resistor R2, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0140] 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;

[0141] 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;

[0142] At this time, it is equivalent to the fifth resistor R5 and the sixth resistor R6 in the impedance network being connected in parallel, the second resistor R2 and the fourth resistor R4 being connected in series and connected 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 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, and the current flowing through the coil Lx is large enough, thereby generating sufficient electromagnetic force to control the switch module 200 to disconnect; 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, and the current flowing through the coil Lx is large enough, thereby generating sufficient electromagnetic force to control the switch module 200 to disconnect. .

[0143] 3.Reference Figure 7 As shown, 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 at the same time:

[0144] 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;

[0145] 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;

[0146] 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;

[0147] 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;

[0148] At this time, it is equivalent to that 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, and the voltage at the connection point of 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, and the current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to disconnect.

[0149] 4.Reference Figure 8As shown, 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 at the same time:

[0150] The first current path is the second current-carrying line, the coil Lx, the seventh resistor R7, the fifth resistor R5, the fourth end d, the sixth end f, the third end c, the first end a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0151] 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 sixth end f, the third end c, the second end b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0152] 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;

[0153] 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;

[0154] At this time, it is equivalent to that 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, 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, and the current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to disconnect.

[0155] 5.Reference Fig. 9 As shown, when the connection between the third terminal c and the sixth terminal f is open, two current paths are formed at the same time:

[0156] The first current path: 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;

[0157] The second current path: 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;

[0158] At this time, it is equivalent to that 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, the first series branch and the second series branch are connected in parallel, and the voltage at the connection point of 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, and the current flowing through the coil Lx is large enough, thereby generating sufficient electromagnetic force to control the switch module 200 to be disconnected; similarly, the voltage at the connection point of 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, and the current flowing through the coil Lx is large enough, thereby generating sufficient electromagnetic force to control the switch module 200 to be disconnected.

[0159] Reference Fig.10 As shown, when the test switch TEST is closed, four current paths are formed at the same time:

[0160] 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;

[0161] 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;

[0162] 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;

[0163] 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;

[0164] The test switch TEST short-circuits the seventh resistor R7, and the voltage at the connection point of 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, and the current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to disconnect; similarly, the voltage at the connection point of 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, and the current flowing through the coil Lx is large enough to generate sufficient electromagnetic force to control the switch module 200 to disconnect.

[0165] Reference Fig.11 In a second aspect of the present application, an electrical connection device 800 is provided, 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.

[0166] In addition, a third aspect of the present application provides an electrical device, including a load device and an electrical connection device 800 as in the above embodiment, wherein the output end of the power cord 100 is connected to the load device.

[0167] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations 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, characterized in that: 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 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; 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: It also 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, characterized in that: The detection protection device further includes a test module, which 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, characterized in that: 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 claim 5, characterized in that: It also includes 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, characterized in that: It also includes an LED indicating unit connected in parallel with the switch unit, and the LED indicating unit includes an eighth impedance element and a light emitting diode connected in series.

14. An electrical connection device, characterized in that: It comprises a shell, a power line and the detection protection device according to any one of claims 1 to 13, wherein the power line is connected to the detection protection device, and the detection protection device is arranged inside the shell.

15. An electrical equipment, characterized in that: The device comprises 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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