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, a first shielding conductor structure and a second shielding conductor structure are arranged in the power line, under the condition that the first shielding conductor structure and / or the second shielding conductor structure are / is open-circuited, a first detection module can generate a first open-circuit signal, and a second detection module can generate a second open-circuit signal; the second detection module can generate a second open-circuit signal, and the driving module 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. Under the condition that the first shielding conductor structure and / or the second shielding conductor structure are / is open-circuited, 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

Technical Field

[0001] This application relates to the technical field of electronic circuits, and particularly to a detection and protection device for a power line, an electrical connection device, and an electrical equipment. Background Art

[0002] A leakage circuit detector interrupter (LCDI) is a power connection device for electrical appliances. It can detect the leakage current of a power line group through a leakage current detection line, and cut off the power connection of the electrical appliance when a certain leakage current is detected to ensure safe use.

[0003] In the existing leakage circuit detector interrupters, when the leakage current detection line of the live wire or the neutral wire in the power line is open-circuited, the electrical appliance can still supply power output. At this time, there may be potential electrical safety hazards for the electrical appliance, but the leakage circuit detector interrupters in the related art cannot reflect the integrity of the leakage current detection line. Summary of the Invention

[0004] Embodiments of this application provide a detection and protection device for a power line, an electrical connection device, and an electrical equipment, 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.

[0005] In a first aspect, embodiments of this application provide a detection and protection device for a power line. The power line includes a first current-carrying line and a second current-carrying line. The power line further includes 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 includes 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 shielding conductor structure includes 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 and the sixth end are connected; The detection and protection device includes: A switch module for controlling the power connection between the input end and the output end of the power line; A first detection module configured to generate a first open-circuit signal when the first shielding conductor structure and / or the second shielding conductor structure is open-circuited; A second detection module configured to generate a second open-circuit signal when the first shielding conductor structure and / or the second shielding conductor structure is open-circuited; The driving module is configured to control the switching 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 of the first shielding conductor structure or the second shielding conductor structure.

[0006] In some embodiments, the first detection module is further configured to generate the first open-circuit signal when an open circuit occurs at at least one of the following positions: The second shielding conductor structure between the fourth end and the sixth end; The first shielding conductor structure between the first end and the third end; The second shielding conductor structure between the fifth end and the sixth end; The connection between the third end and the sixth end; The second detection module is further configured to generate the second open-circuit signal when an open circuit occurs at at least one of the following positions: The second shielding conductor structure between the fifth end and the sixth end; The first shielding conductor structure between the second end and the third end; The second shielding conductor structure between the fourth end and the sixth end; The connection between the third end and the sixth end.

[0007] In some embodiments, the first detection module includes a first impedance element, the first end is connected to the second current-carrying line through the first impedance element, the second detection module includes a second impedance element, the second end is connected to the second current-carrying line through the second impedance element, the first connection end of the driving module is connected to the connection point between the first impedance element and the first end, the second connection end of the driving module is connected to the connection point between the second impedance element and the second end, and the third connection end of the driving module is connected to the first current-carrying line.

[0008] In some embodiments, the detection and protection device further includes a third impedance element and a fourth impedance element, the fourth end is connected to the first current-carrying line through the third impedance element, and the fifth end is connected to the first current-carrying line through the fourth impedance element; In the case of an open circuit in the second shielding conductor structure between the fourth end and the sixth end, the first impedance element is configured to cooperate with the fourth impedance element to generate the first open-circuit signal, and the second impedance element is configured to cooperate with the fourth impedance element to generate the second open-circuit signal; In the case of an open circuit occurring in the second shielding conductor structure between the fifth terminal and the sixth terminal, the first impedance element is configured to cooperate with the third impedance element to generate the first open-circuit signal, and the second impedance element is configured to cooperate with the third impedance element to generate the second open-circuit signal; In the case of an open circuit occurring in the first shielding conductor structure between the first terminal and the third terminal, the first impedance element is configured to generate the first open-circuit signal; In the case of an open circuit occurring in the first shielding conductor structure between the second terminal and the third terminal, the second impedance element is configured to generate the second open-circuit signal; In the case of an open circuit occurring in the connection between the third terminal and the sixth terminal, the first impedance element is configured to generate the first open-circuit signal, and the second impedance element is configured to generate the second open-circuit signal.

[0009] In some embodiments, the drive module includes a fifth impedance element, a sixth impedance element, a first zener diode, and a second zener diode. One end of the fifth impedance element is connected to the connection point between the third impedance element and the fourth impedance element. The other end of the fifth impedance element is connected to the positive electrodes of the first zener diode and the second zener diode through the sixth impedance element. The negative electrode of the first zener diode is connected to the connection point between the first impedance element and the first terminal. The negative electrode of the second zener diode is connected to the connection point between the second impedance element and the second terminal.

[0010] In some embodiments, the detection and protection device further includes a switch trip drive unit. The switch trip 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. In the case where 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.

[0011] In some embodiments, the switch unit includes a first switching tube. The connection point between the fifth impedance element and the sixth impedance element is connected to the control pin of the first switching tube.

[0012] In some embodiments, the switch trip driving unit further includes a first diode and a second diode; the positive electrode of the first diode, the positive electrode of the second diode, and one switching pin of the first switching tube are all connected to the connection point of the third impedance element and the fourth impedance element; the negative electrode of the first diode is connected to the first current-carrying line; the negative electrode of the second diode and the other switching pin of the first switching tube are both connected to one end of the coil, and the other end of the coil is connected to the second current-carrying line.

[0013] In some embodiments, the detection and protection device further includes a test module, and the test module is configured to short-circuit the first detection module and / or the second detection module after being triggered.

[0014] In some embodiments, the test module includes a test switch, and the first impedance element and the second impedance element are connected to the second current-carrying line through the coil; the test switch is connected in parallel with the first impedance element or the second impedance element; Alternatively, one end of the test switch is connected to the connection point of the first impedance element and the second impedance element, and the other end is connected to the first shielding conductor structure or the second shielding conductor structure.

[0015] In some embodiments, a lightning protection module is further included, one end of the lightning protection module 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.

[0016] In some embodiments, an LED indication unit connected in parallel with the switch unit is further included, and the LED indication unit includes a seventh impedance element and a light-emitting diode connected in series.

[0017] In a second aspect, an embodiment of the present application provides an electrical connection device, including a housing, a power cord, and the detection and protection device described in the first aspect, the power cord is connected to the detection and protection device, and the detection and protection device is disposed inside the housing.

[0018] In a third aspect, an embodiment of the present application provides an electrical equipment, including a load device and the electrical connection device described in the second aspect, and the output end of the power cord is connected to the load device.

[0019] The detection and protection device for the power cord, the electrical connection device, and the electrical equipment according to the embodiments of the present application have at least the following beneficial effects: In the power cord, the first shielding conductor structure between the first end and the third end, the first shielding conductor structure between the third end and the second end, the second shielding conductor structure between the fourth end and the sixth end, the second shielding 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 an open circuit occurs in the first shielding conductor structure and / or the second shielding conductor structure, the first detection module can generate a first open-circuit signal, and the second detection module can generate a second open-circuit signal. When the drive module detects the first open-circuit signal, the second open-circuit signal, or the leakage signal, it can control the switch module to disconnect the power connection between the input end and the output end of the power cord. In this way, when the integrity of the first shielding conductor structure and / or the second shielding conductor structure is damaged, that is, an open circuit occurs, the power connection of the power cord can be triggered to be disconnected through the corresponding open-circuit signal, thereby ensuring electrical safety.

[0020] Other features and advantages of the present application will be described in the following specification, and in part, will be obvious from the specification, or will be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the module connection of the detection and protection device provided by the embodiment of the present application; Figure 2 is a circuit diagram of the detection and protection device provided by the embodiment of the present application; Figure 3 is a schematic diagram of the current flow of the detection and protection device provided by the embodiment of the present application under normal working conditions; Figure 4 is a schematic diagram of the current flow when there is a leakage current in the first shielding conductor structure and / or the second shielding conductor structure provided by the embodiment of the present application; Figure 5 is a schematic diagram of the current flow when an open circuit occurs in the second shielding conductor structure from the fourth end to the sixth end provided by the embodiment of the present application; Figure 6 is a schematic diagram of the current flow when an open circuit occurs in the second shielding conductor structure from the sixth end to the fifth end provided by the embodiment of the present application; Figure 7 is a schematic diagram of the current flow when an open circuit occurs in the first shielding conductor structure from the first end to the third end provided by the embodiment of the present application; Figure 8It is a schematic diagram of current flow when there is an open circuit in the first shielding conductor structure from the third end to the second end provided by an embodiment of the present application; Figure 9 It is a schematic diagram of an open circuit in the connection from the third end to the sixth end provided by an embodiment of the present application; Figure 10 It is a schematic diagram of current flow when the test switch provided by an embodiment of the present application is closed; Figure 11 It is a schematic diagram of the structure of the electrical connection device provided by an embodiment of the present application. Detailed implementation manners

[0022] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Additionally, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean that they are necessary sequences unless it is stated that a certain sequence must be followed.

[0023] In the description of the present application, the meaning of "a number of" is one or more, the meaning of "a plurality of" is more than two, "greater than", "less than", "exceeding", etc. are understood as not including the number itself, and "above", "below", "within", etc. are understood as including the number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0024] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0025] A leakage current detection circuit breaker, i.e., 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 a 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 supply line. Currently, all LCDIs are designed for leakage current detection. By designing a corresponding circuit connected to the shielding layer, the leakage current signal can be detected from the shielding layer, thereby triggering the disconnection of the power connection of the power supply line; however, for the case where the shielded wire is open, the leakage current cannot be detected, so the disconnection of the power connection of the power supply line will not be triggered, and there will be no fault prompt either, which poses a potential safety hazard to the electrical appliance.

[0026] Based on this, the embodiments of the present application provide a detection and protection device for a power supply line, an electrical connection device and an electrical device. The power supply line wraps a first current-carrying line through a first shield conductor structure and includes a second current-carrying line through a second shield conductor structure. The first shield conductor structure is divided into a first end, a second end and a third end, and the second shield conductor structure is divided into a fourth end, a fifth end and a sixth end. The third end and the sixth end are connected, and 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 detection module and a second detection module are configured in the detection and protection device, which are respectively used to detect the open-circuit conditions of the first shield conductor structure and the second shield conductor structure, generate a first open-circuit signal and a second open-circuit signal when an open circuit occurs, and a drive module in the detection and protection device receives the first open-circuit signal and the second open-circuit signal, and can then control the switch module to disconnect the power connection between the input end and the output end of the power supply line. Through the above detection and protection device, the integrity of the shielding layer of the power supply line can be detected, and the power connection of the power supply line can be disconnected when the shielding layer is open, ensuring electrical safety.

[0027] The detection and protection device for a power supply line, an electrical connection device and an electrical device will be described below with reference to the accompanying drawings.

[0028] Refer to Figure 1 As shown, the power supply line 100 includes a first current-carrying line and a second current-carrying line. The power supply line 100 further includes a first shield conductor structure 110 covering the first current-carrying line and a second shield conductor structure 120 covering the second current-carrying line. The first shield conductor structure 110 includes a first end a near the input end of the power supply line 100, a second end b near the output end of the power supply line 100, and a third end c located between the first end a and the second end b. The second shield conductor structure 120 includes a fourth end d near the input end of the power supply line 100, a fifth end e near the output end of the power supply line 100, and a sixth end f located between the fourth end d and the fifth end e; the third end c and the sixth end f are connected; The detection and protection device 300 includes: A switch module 200, which is used to control the power connection between the input end and the output end of the power supply line 100; The first detection module 310 is configured to generate a first open-circuit signal when an open circuit occurs in the first shielding conductor structure 110 and / or the second shielding conductor structure 120; The second detection module 320 is configured to generate a second open-circuit signal when an open circuit occurs in the first shielding conductor structure 110 and / or the second shielding conductor structure 120; The driving module 330 is configured to control the switch module 200 to disconnect the power connection between the input end and the output end of the power line 100 when the first open-circuit signal, the second open-circuit signal, or a leakage signal of the first shielding conductor structure 110 or the second shielding conductor structure 120 is detected.

[0029] A power line 100 is connected between the electrical connection device and the load device. The power line 100 includes a first current-carrying line and a second current-carrying line. The first current-carrying line is wrapped by the first shielding conductor structure 110, and the second current-carrying line is wrapped by the second shielding conductor structure 120. An insulating layer of the first current-carrying line is provided between the first current-carrying line and the first shielding conductor structure 110, and an insulating layer of the second current-carrying line is provided between the second current-carrying line and the second shielding conductor structure 120. In the case of a leakage current, after the insulating layer on the surface of the first current-carrying line is damaged, when the first current-carrying line contacts the first shielding conductor structure 110 and causes a leakage current in the first shielding conductor structure 110, the leakage signal of the leakage current can be detected by the driving module 330, and then the switch module 200 is triggered to disconnect. Similarly, after the insulating layer on the surface of the second current-carrying line is damaged, when the second current-carrying line contacts the second shielding conductor structure 120 and causes a leakage current in the second shielding conductor structure 120, the leakage signal of the leakage current can be detected by the driving module 330, and then the switch module 200 is triggered to disconnect. In the case of an open circuit, when an open circuit occurs in the first shielding conductor structure 110, both the first detection unit and the second detection unit can generate corresponding open-circuit signals, so that the driving module 330 detects the first open-circuit signal and the second open-circuit signal, and then triggers the switch module 200 to disconnect. Similarly, when an open circuit occurs in the second shielding conductor structure 120, both the first detection unit and the second detection unit can generate corresponding open-circuit signals, so that the driving module 330 detects the first open-circuit signal and the second open-circuit signal, and then triggers the switch module 200 to disconnect.

[0030] On the power line 100, the first end a of the first shielding conductor structure 110 can be connected to the detection protection device 300 through the first wire 410, the second end b can be connected to the detection protection device 300 through the first return wire 510, the fourth end d of the second shielding conductor structure 120 can be connected to the detection protection device 300 through the second wire 420, and the fifth end e can be connected to the detection protection device 300 through the second return wire 520. The detection protection device 300 forms a detection path with the first end a, the second end b, the fourth end d, and the fifth end e through the first detection module 310 and the second detection module 320, so as to detect the leakage signal and open circuit condition of the first shielding conductor structure 110 and the second shielding conductor structure 120.

[0031] Specifically, the first shielding conductor structure 110 between the first end a and the third end c, the first shielding conductor structure 110 between the third end c and the second end b, the second shielding conductor structure 120 between the fourth end d and the sixth end f, the second shielding 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 detection module 310 is further configured to generate a first open circuit signal when an open circuit occurs at at least one of the following positions: The second shielding conductor structure 120 between the fourth end d and the sixth end f; The first shielding conductor structure 110 between the first end a and the third end c; The second shielding conductor structure 120 between the fifth end e and the sixth end f; The connection between the third end c and the sixth end f; It can be seen from this that the first open circuit signal of the first detection module 310 is generated when an open circuit occurs at any position among the above corresponding four positions. In response to the open circuit conditions at the above four positions, the driving module 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.

[0032] The second detection module 320 is further configured to generate a second open circuit signal when an open circuit occurs at at least one of the following positions: The second shielding conductor structure 120 between the fifth end e and the sixth end f; The first shielding conductor structure 110 between the second end b and the third end c; The second shielding conductor structure 120 between the fourth end d and the sixth end f; The connection between the third end c and the sixth end f.

[0033] It can be seen from this that the first open-circuit signal of the first detection module 310 is generated when an open circuit occurs at any of the above corresponding four positions, and the second open-circuit signal of the second detection module 320 is generated when an open circuit occurs at any of the above corresponding four positions; for the case of an open circuit occurring at the above four positions, the driving module 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.

[0034] 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 line 100. When an open circuit occurs at any of the above positions of the shielding layer, the detection and protection device 300 can disconnect the power connection of the power line 100. The detection and protection device 300 can also trigger the disconnection of the power connection of the power line 100 through the leakage signal of the shielding layer. Therefore, whether the power line 100 has a leakage or the shielding layer is open, the detection and protection device 300 of the embodiment of the present application can cut off the power connection of the power line 100, thereby ensuring electrical safety.

[0035] The following is an example to illustrate the specific circuit structure of the above detection and protection device 300.

[0036] Refer to Figure 2 As shown, in some embodiments, the first detection module 310 includes a first impedance element, and the first end a is connected to the second current-carrying line through the first impedance element. The second detection module 320 includes a second impedance element, and the second end b is connected to the second current-carrying line through the second impedance element. The first connection end of the driving module 330 is connected to the connection point between the first impedance element and the first end a, the second connection end of the driving module 330 is connected to the connection point between the second impedance element and the second end b, and the third connection end of the driving module 330 is connected to the first current-carrying line.

[0037] For the convenience of description, in this embodiment, the first impedance element is represented as the first resistor R1 in Figure 2 and the second impedance element is represented as the second resistor R2 in Figure 2 ; 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-parallel. The first resistor R1 and the second resistor R2 can also be other voltage-drop elements and their combinations, such as inductors, capacitors, or any combination of capacitors, inductors, and resistors.

[0038] One end of the first resistor R1 is connected to the second current-carrying line, and the other end of the first resistor R1 is connected to the first terminal a and the first connection end of the driving module 330. One end of the second resistor R2 is connected to the second current-carrying line, and the other end of the second resistor R2 is connected to the second terminal b and the second connection end of the driving module 330. Therefore, both the first resistor R1 and the second resistor R2 are connected to the second current-carrying line. The current in the second current-carrying line passes through the first resistor R1 to the driving module 330 and the first terminal a, and also passes through the second resistor R2 to the driving module 330 and the second terminal b. Since both the first terminal a and the second terminal b are located in the first shielding conductor structure 110, and the first shielding conductor structure 110 is also electrically connected to the sixth terminal f of the second shielding conductor structure 120 through the third terminal c, and the third terminal c of the first shielding conductor structure 110 is connected to the first terminal a and the second terminal b, the second current-carrying line is actually connected to the first shielding conductor structure 110 and the second shielding conductor structure 120 through the first resistor R1 and the second resistor R2, and the driving module 330 is also connected to the first shielding conductor structure 110 and the second shielding conductor structure 120. It can be seen from this that when an open circuit occurs on the first shielding conductor structure 110 and the second shielding conductor structure 120, the current conditions of the first shielding conductor structure 110 and the second shielding conductor structure 120 change; at this time, the current flowing through the first resistor R1 changes, and this current change corresponds to the first open-circuit signal, which in turn triggers the driving module 330. Similarly, the current flowing through the second resistor R2 changes, and this current change corresponds to the second open-circuit signal, which in turn triggers the driving module 330, thereby realizing the open-circuit detection of the shielded wire.

[0039] Referring to Figure 2 As shown, in some embodiments, the detection and protection device 300 further includes a third impedance element and a fourth impedance element. The fourth terminal d is connected to the first current-carrying line through the third impedance element, and the fifth terminal e is connected to the first current-carrying line through the fourth impedance element; In the case of an open circuit occurring in the first shielding conductor structure 110 between the fourth terminal d and the sixth terminal f, the first impedance element is configured to cooperate with the fourth impedance element to generate a first open-circuit signal, and the second impedance element is configured to cooperate with the fourth impedance element to generate a second open-circuit signal; In the case of an open circuit occurring in the first shielding conductor structure 110 between the fifth terminal e and the sixth terminal f, the first impedance element is configured to cooperate with the third impedance element to generate a first open-circuit signal, and the second impedance element is configured to cooperate with the third impedance element to generate a second open-circuit signal; In the case of an open circuit occurring in the second shielding conductor structure 120 between the first terminal a and the third terminal c, the first impedance element is configured to generate a first open-circuit signal; In the case of an open circuit occurring in the second shielding conductor structure 120 between the second terminal b and the third terminal c, the second impedance element is configured to generate a second open-circuit signal; In the case of an open circuit occurring in the connection between the third terminal c and the sixth terminal f, the first impedance element is configured to generate a first open-circuit signal, and the second impedance element is configured to generate a second open-circuit signal.

[0040] For the sake of convenience in description, in this embodiment, the third impedance element is represented as the third resistor R3 in Figure 2 and the fourth impedance element is represented as the fourth resistor R4 in Figure 2 ; it can be understood that the third resistor R3 and the fourth resistor R4 can be a single resistor element, or a resistor network composed of multiple resistors in series, parallel, or series-parallel. The third resistor R3 and the fourth resistor R4 can also be other voltage-drop elements and their combinations, such as inductors, capacitors, or any combination of capacitors, inductors, and resistors.

[0041] 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 fourth terminal d. One end of the fourth resistor R4 is connected to the first current-carrying line, and the other end of the fourth resistor R4 is connected to the fifth terminal e. Therefore, both the third resistor R3 and the fourth resistor R4 are connected to the first current-carrying line; then, the second current-carrying line is connected to the first current-carrying line through the first resistor R1, the second shielding conductor structure 120, the first shielding conductor structure 110, and the third resistor R3, and the second current-carrying line is connected to the first current-carrying line through the second resistor R2, the second shielding conductor structure 120, the first shielding conductor structure 110, and the fourth resistor R4.

[0042] From this, it can be seen that when an open circuit occurs in the first shielding conductor structure and / or the second shielding conductor structure, there is a cooperation among the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 to generate an open-circuit signal for open-circuit detection. Specifically: When an open circuit occurs in the second shielding conductor structure 120 between the fifth terminal e and the sixth terminal f, the second current-carrying line, the first resistor R1, the first terminal a, the third terminal c, the sixth terminal f, the fourth terminal d, and the third resistor R3 form a current path, and the currents on the first resistor R1 and the third resistor R3 change. That is, the first resistor R1 cooperates with the third resistor R3 to generate a first open-circuit signal corresponding to the current change, thereby triggering the driving module 330. At the same time, the second current-carrying line, the second resistor R2, the second terminal b, the third terminal c, the sixth terminal f, the fourth terminal d, and the third resistor R3 form a current path, and the currents on the second resistor R2 and the third resistor R3 change. That is, the second resistor R2 cooperates with the third resistor R3 to generate a second open-circuit signal corresponding to the current change, thereby triggering the driving module 330.

[0043] When an open circuit occurs in the second shielding conductor structure 120 between the fourth terminal d and the sixth terminal f, the second current-carrying line, the second resistor R2, the second terminal b, the third terminal c, the sixth terminal f, the fifth terminal e, and the fourth resistor R4 form a current path, and the currents on the second resistor R2 and the fourth resistor R4 change. That is, the second resistor R2 cooperates with the fourth resistor R4 to generate a second open-circuit signal corresponding to the current change, thereby triggering the driving module 330. At the same time, the second current-carrying line, the first resistor R1, the first terminal a, the third terminal c, the sixth terminal f, the fifth terminal e, and the fourth resistor R4 form a current path, and the currents on the first resistor R1 and the fourth resistor R4 change. That is, the first resistor R1 cooperates with the fourth resistor R4 to generate a first open-circuit signal corresponding to the current change, thereby triggering the driving module 330.

[0044] When an open circuit occurs in the first shielding conductor structure 110 between the first terminal a and the third terminal c, that is, the connection between the first resistor R1 and the first terminal a is open, the voltage of the first resistor R1 increases, thereby generating a first open-circuit signal to the driving module 330, and then triggering the driving module 330; When an open circuit occurs in the first shielding conductor structure 110 between the second terminal b and the third terminal c, that is, the connection between the second resistor R2 and the second terminal b is open, the voltage of the second resistor R2 increases, thereby generating a second open-circuit signal to the driving module 330, and then triggering the driving module 330; When the connection between the third terminal c and the sixth terminal f is open, that is, the connection between the first resistor R1 and the first terminal a is open and the connection between the second resistor R2 and the second terminal b is open, the voltage of the first resistor R1 increases, thereby generating a first open-circuit signal to trigger the driving module 330, and the voltage of the second resistor R2 increases, thereby generating a second open-circuit signal to trigger the driving module 330.

[0045] Referring to Figure 2 As shown, in some embodiments, the driving module 330 includes a fifth impedance element, a sixth impedance element, a first zener diode ZD1, and a second zener diode ZD2. One end of the fifth impedance element is connected to the connection point of the third impedance element and the fourth impedance element. The other end of the fifth impedance element is connected to the positive electrodes of the first zener diode ZD1 and the second zener diode ZD2 through the sixth impedance element. The negative electrode of the first zener diode ZD1 is connected to the connection point of the first impedance element and the first terminal a. The negative electrode of the second zener diode ZD2 is connected to the connection point of the second impedance element and the second terminal b.

[0046] For convenience of description, in this embodiment, the fifth impedance element is represented as the fifth resistor R5 in Figure 2 and the sixth impedance element is represented as the sixth resistor R6 in Figure 2It is denoted as the sixth resistor R6 in the figure. It can be understood that the fifth resistor R5 and the sixth resistor R6 can be a single resistor element, or a resistor network composed of multiple resistors connected in series, parallel, or in series-parallel combinations. The fifth resistor R5 and the sixth resistor R6 can also be other voltage-drop elements and their combinations, such as inductors, capacitors, or any combination of capacitors, inductors, and resistors.

[0047] The fifth resistor R5 is connected to the first current-carrying line and is connected to the connection point of the third resistor R3 and the fourth resistor R4. The first voltage-regulating diode ZD1 is connected to the connection point of the first resistor R1 and the first terminal a, and the second voltage-regulating diode ZD2 is connected to the connection point of the second resistor R2 and the second terminal b. Then, the second current-carrying line is respectively connected to the first resistor R1 and the second resistor R2, and then passes through the first shielding conductor structure 110 and the second shielding conductor structure 120, and through the third resistor R3 and the fourth resistor R4 to be connected to the first current-carrying line. If a leakage current occurs in the first shielding conductor structure 110 and / or the second shielding conductor structure 120, the leakage current can be directly conducted to the drive module 330. At this time, the drive module 330 receives the first open-circuit signal through the first voltage-regulating diode ZD1, and can also directly receive the leakage signal from the first shielding conductor structure 110 and / or the second shielding conductor structure 120. The drive module 330 also receives the second open-circuit signal through the second voltage-regulating diode ZD2, and can also receive the leakage signal from the first shielding conductor structure 110 and / or the second shielding conductor structure 120.

[0048] It can be understood that in the case where there is no leakage current and no open circuit in the first shielding conductor structure 110 and the second shielding conductor structure 120, in the impedance network composed of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4, the voltage at the connection point of the first resistor R1 and the first terminal a does not exceed the breakdown voltage of the first voltage-regulating diode ZD1, and the voltage at the connection point of the second resistor R2 and the second terminal b does not exceed the breakdown voltage of the second voltage-regulating diode ZD2. At this time, the detection and protection device 300 does not affect the normal operation of the power line 100. When a leakage current occurs in the above impedance network, or an open circuit occurs in the first shielding conductor structure 110 and / or the second shielding conductor structure 120, the voltage on the impedance network changes accordingly, which will cause the first voltage-regulating diode ZD1 and / or the second voltage-regulating diode ZD2 to break down, thereby triggering the drive module 330 to control the switch module 200 to disconnect the power connection of the power line 100. This part of the process will be described in detail later.

[0049] Refer to Figure 2As shown, in some embodiments, the detection and protection device 300 further includes a switch trip driving unit 340. The switch trip driving unit 340 includes a switch unit and a coil Lx for generating an electromagnetic force to drive the switch module 200. The second current-carrying line, the coil Lx, the switch unit, and the first current-carrying line are connected in sequence. 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.

[0050] 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 trip driving unit 340 uses the electromagnetic force generated by the energization of 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 directly controlled to turn on by the driving module 330, or indirectly. For example, when the driving module 330 receives the first open-circuit signal, the second open-circuit signal, or the leakage signal, the switch unit is triggered to turn on through 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 transistor, which is not limited herein.

[0051] Refer to Figure 2 As shown, in some embodiments, the switch unit includes a first switch tube Q1, and the connection point of the fifth impedance element and the sixth impedance element is connected to the control pin of the first switch tube Q1.

[0052] In this embodiment, the driving module 330 is used to directly control the conduction of the switch unit, and the first switch tube Q1 is configured for the driving module 330. In the driving module 330, the voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 is used to control the conduction and turn-off of the first switch tube Q1. When the driving module 330 receives the first open-circuit signal, the second open-circuit signal, or the leakage signal, which causes the voltage at the connection point of 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 disconnect.

[0053] Refer to Figure 2 As shown, in some embodiments, the switch trip driving unit 340 further includes a first diode D1 and a second diode D2; the positive electrode of the first diode D1, the positive electrode of the second diode D2, and one switch pin of the first switch tube Q1 are all connected to the connection point of the third impedance element and the fourth impedance element; the negative electrode of the first diode D1 is connected to the first current-carrying line; the negative electrode of the second diode D2 and the other switch pin of the first switch tube Q1 are both connected to one end of the coil Lx, and the other end of the coil Lx is connected to the second current-carrying line.

[0054] The first switching transistor Q1 is connected between the first current-carrying line and the second current-carrying line. The first diode D1 restricts the current to flow only from the second current-carrying line through the first switching transistor Q1 to the first current-carrying line when the first switching transistor Q1 is turned on. When the first voltage-regulating diode ZD1 is broken down, a path is formed among the second current-carrying line, the coil Lx, the first resistor R1, the first voltage-regulating diode ZD1, the sixth resistor R6, the fifth resistor R5, the first diode D1, and the first current-carrying line. When the second voltage-regulating diode ZD2 is broken down, a path is formed among the second current-carrying line, the coil Lx, the second resistor R2, the second voltage-regulating diode ZD2, the sixth resistor R6, the fifth resistor R5, the first diode D1, and the first current-carrying line.

[0055] It can be understood that when the voltage on the first current-carrying line and / or the second current-carrying line fluctuates, the voltage on the first shielding conductor structure 110 and the second shielding conductor structure 120 increases. As a result, the voltage applied to the negative electrodes of the first voltage-regulating diode ZD1 and the second voltage-regulating diode ZD2 increases. If the voltage exceeds the breakdown voltage of the first voltage-regulating diode ZD1 or the second voltage-regulating diode ZD2, the first switching transistor Q1 can be triggered to turn on, and the trigger switch tripping drive unit 340 controls the switch module 200 to disconnect the power connection between the input end and the output end of the power line 100. Therefore, the detection and protection device of the embodiment of the present application is applicable not only to triggering tripping in the case of an open circuit and leakage current in the shielding layer, but also to triggering tripping in the case of voltage fluctuations in the current-carrying line, realizing the overvoltage protection function of the current-carrying line.

[0056] Refer to Figure 2As shown, in some embodiments, the detection protection device 300 further includes a test module configured to short-circuit the first detection module 310 and / or the second detection module 320 after being triggered. The test module provides a test function to the user. After the test module is activated, if the LCDI device can disconnect the power connection between the power lines 100, it indicates that the inside of the LCDI device is normal. There is a certain connection relationship between the test module and the first detection module 310 and the second detection module 320 in the circuit, so that the first detection module 310 and / or the second detection module 320 can be short-circuited after the test module is activated. When the test module shorts the first detection module 310, the second current-carrying line directly connects to the third terminal c after passing through the branch where the coil Lx and the test module are located. Since the second detection module 320 is also connected to the third terminal c, the second detection module 320 is also short-circuited, resulting in an increase in the voltages at the negative electrodes of the first zener diode ZD1 and the second zener diode ZD2. The first zener diode ZD1 and the second zener diode ZD2 are broken down, and then the first switching transistor Q1 is turned on. The second current-carrying line connects to the first current-carrying line through the coil Lx, and the current passing through the coil Lx is large enough to generate a large enough electromagnetic force to control the switch module 200 to disconnect. Similarly, when the test module shorts the second detection module 320, the second current-carrying line directly connects to the third terminal c after passing through the branch where the coil Lx and the test module are located. Since the first detection module 310 is also connected to the third terminal c, the first detection module 310 is also short-circuited, resulting in an increase in the voltages at the negative electrodes of the first zener diode ZD1 and the second zener diode ZD2. The first zener diode ZD1 and the second zener diode ZD2 are broken down, and then the first switching transistor Q1 is turned on. The second current-carrying line connects to the first current-carrying line through the coil Lx, and the current passing through the coil Lx is large enough to generate a large enough electromagnetic force to control the switch module 200 to disconnect.

[0057] Specifically, the test module includes a test switch TEST, and the first impedance element and the second impedance element are connected to the second current-carrying line through the coil Lx; The test switch TEST is connected in parallel with the first impedance element or the second impedance element; Alternatively, one end of the test switch TEST is connected to the connection point of the first impedance element and the second impedance element, and the other end is connected to the first shielding conductor structure 110 or the second shielding conductor structure 120.

[0058] The test switch TEST is connected in parallel across either the first resistor R1 or the second resistor R2. When the test switch TEST is closed, either the first resistor R1 or the second resistor R2 is short-circuited. According to the above analysis, the second resistor R2 and the first resistor R1 are short-circuited, which can trigger the breakdown of the first zener diode ZD1 and the second zener diode ZD2. Subsequently, the first switching transistor Q1 is turned on, and finally, an electromagnetic force is generated in the coil Lx to control the disconnection of the switch module 200. In Figure 2 , the test switch TEST is connected in parallel with the first resistor R1. When the test switch TEST is closed, the second current-carrying line passes through the branch where the coil Lx and the test switch TEST are located, causing the voltages at the negative terminals of the first zener diode ZD1 and the second zener diode ZD2 to rise. The first zener diode ZD1 and the second zener diode ZD2 are broken down, and then the first switching transistor Q1 is turned on. The second current-carrying line is connected to the first current-carrying line through the coil Lx, and the current passing through the coil Lx is large enough to generate a large enough electromagnetic force to control the disconnection of the switch module 200.

[0059] In addition, one end of the test switch TEST can be set at the connection point of the first resistor R1 and the second resistor R2, and the other end is connected to the first shielding conductor structure 110 or the second shielding conductor structure 120. Since both the first resistor R1 and the second resistor R2 are connected to the third terminal c, this setting method of the test switch TEST is actually also in parallel with the first resistor R1 and the second resistor R2. Because the points on the first shielding conductor structure 110 and the second shielding conductor structure 120 are at the same potential, when the test switch TEST is closed, it actually short-circuits the first resistor R1 and the second resistor R2, and can also trigger the breakdown of the first zener diode ZD1 and the second zener diode ZD2, causing the coil Lx to generate a large enough electromagnetic force to control the disconnection of the switch module 200.

[0060] Refer to Figure 2 As shown, in some embodiments, a lightning protection module 600 is further 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 momentary large current appears between the first current-carrying line and the second current-carrying line, the resistance value of the first varistor ZR1 rapidly increases to protect the circuit from the impact of the large current. In addition, a second varistor ZR2 is also provided in the switch trip driving unit 340. 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 a momentary large current from appearing in the switch trip driving unit 340 and impacting the circuit components.

[0061] Refer to Figure 2As shown, in some embodiments, it further includes an LED indication unit 700 connected in parallel with the switch unit. The LED indication unit 700 includes a seventh impedance element and a light-emitting diode LED1 connected in series. One end of the LED indication unit 700 is connected to the first current-carrying line through a first diode D1, and the other end is connected to the second current-carrying line through a coil Lx. When the circuit is operating normally, the current of the second current-carrying line reaches the light-emitting diode LED1 through the coil Lx, and then passes through the first diode D1 to the first current-carrying line. At this time, the light-emitting diode LED1 emits light, indicating the current working state of the LCDI device to the user. Among them, the seventh impedance element is Figure 2 represented as the series connection of a seventh resistor R7 and an eighth resistor R8 in Figure 2 ; it can be understood that the seventh resistor R7 and the eighth resistor R8 can be a single resistor element, or a resistor network composed of multiple resistors connected in series, parallel, or in series-parallel. The seventh resistor R7 and the eighth resistor R8 can also be other voltage-drop elements and their combinations, such as inductors, capacitors, or any combination of capacitors, inductors, and resistors.

[0062] Through the above detection and protection device 300, when an open circuit occurs in the first shielding conductor structure 110 and / or the second shielding conductor structure 120, or when a leakage current occurs in the control switch module 200 of the first shielding conductor structure 110 and / or the second shielding conductor structure 120, the power connection between the input end and the output end of the power line 100 can be disconnected, realizing the disconnection of the power connection of the power line 100 triggered by leakage, and also realizing the disconnection of the power connection of the power line 100 triggered by an open circuit of the shielded wire.

[0063] A specific example is used below to illustrate the detection and protection device 300 of the embodiment of the present application in detail.

[0064] Referring to Figure 2 the circuit diagram of the detection and protection device 300 shown.

[0065] For the first shielding conductor structure 110 of the power line 100, a first end a is arranged near the input end of the power line 100, a second end b is arranged near the output end of the power line 100, and a third end c is arranged between the first end a and the second end b. For the second shielding conductor structure 120 of the power line 100, a fourth end d is arranged near the input end of the power line 100, a fifth end e is arranged near the output end of the power line 100, and a sixth end f is arranged between the fourth end d and the fifth end e. The third end c and the sixth end f are connected.

[0066] The detection and protection device 300 is connected to the first shielding conductor structure 110 and the second shielding conductor structure 120 to achieve leakage detection and open - circuit detection. Specifically, the detection and protection device 300 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. One end of the first resistor R1 and one end of the second resistor R2 are both connected to the second current - carrying line through the coil Lx. The other end of the first resistor R1 is connected to the negative electrode of the first voltage - stabilizing diode ZD1 in the driving module 330, and the other end of the first resistor R1 is also connected to the first terminal a. The other end of the second resistor R2 is connected to the negative electrode of the second voltage - stabilizing diode ZD2 in the driving module 330, and the other end of the second resistor R2 is also connected to the second terminal b. One end of the third resistor R3 and one end of the fourth resistor R4 are both connected to the first current - carrying line through the first diode D1. The other end of the third resistor R3 is connected to the fourth terminal d, and the other end of the fourth resistor R4 is connected to the fifth terminal e.

[0067] The driving module 330 includes a fifth resistor R5, a sixth resistor R6, a first voltage - stabilizing diode ZD1, and a second voltage - stabilizing diode ZD2. The fifth resistor R5 and the sixth resistor R6 are connected in series. The sixth resistor R6 is connected to the positive electrode of the first voltage - stabilizing diode ZD1 and the positive electrode of the second voltage - stabilizing diode ZD2 respectively. The negative electrode of the first voltage - stabilizing diode ZD1 is connected to the connection point of the first resistor R1 and the first terminal a. The negative electrode of the second voltage - stabilizing diode ZD2 is connected to the connection point of the second resistor R2 and the second terminal b. The fifth resistor R5 is connected to the connection point of the third resistor R3 and the fourth resistor R4. The connection point of the fifth resistor R5 and the sixth resistor R6 is used to output a control voltage to the switch - tripping drive unit 340.

[0068] The switch - tripping drive unit 340 includes a switching transistor Q1. The control pin of the switching transistor Q1 is connected to the connection point of the fifth resistor R5 and the sixth resistor R6. One switching pin of the first switching transistor Q1 is connected to the connection point of the third resistor R3 and the fourth resistor R4, and the other switching pin is connected to the connection point of the first resistor R1 and the second resistor R2.

[0069] The detection and protection device 300 further includes a test switch TEST, and the test switch TEST is connected in parallel with the first resistor R1.

[0070] When a large enough 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 after its own disconnection, it disconnects the electrical connection between the first current - carrying line and the second current - carrying line, thereby disconnecting the connection between the mains power and the electrical equipment.

[0071] Refer to Figure 3 As shown, in the case where 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 operates normally, and at the same time, four current paths are formed: The first current path is: the second current-carrying line, coil Lx, first resistor R1, first terminal a, third terminal c, sixth terminal f, fourth terminal d, third resistor R3, first diode D1, first current-carrying line; The second current path is: the second current-carrying line, coil Lx, first resistor R1, first terminal a, third terminal c, sixth terminal f, fifth terminal e, fourth resistor R4, first diode D1, first current-carrying line; The third current path is: the second current-carrying line, coil Lx, second resistor R2, second terminal b, third terminal c, sixth terminal f, fifth terminal e, fourth resistor R4, first diode D1, first current-carrying line; The fourth current path is: the second current-carrying line, coil Lx, second resistor R2, second terminal b, third terminal c, sixth terminal f, fourth terminal d, third resistor R3, first diode D1, first current-carrying line; Since the first resistor R1, second resistor R2, third resistor R3 and fourth resistor R4 form an impedance network to reduce the current of the above current paths, the current flowing through the coil Lx is not large enough to disconnect the switch module 200, and the voltage at the connection point of the first resistor R1 and the first terminal a does not exceed the breakdown voltage of the first voltage-regulating diode ZD1, and the voltage at the connection point of the second resistor R2 and the second terminal b does not exceed the breakdown voltage of the second voltage-regulating diode ZD2.

[0072] Refer to Figure 4 As shown, in the case of leakage current in the first shielding conductor structure 110 and / or the second shielding conductor structure 120, the voltage at the connection point of the first resistor R1 and the first terminal a rises, exceeding the breakdown voltage of the first voltage-regulating diode ZD1, and the voltage at the connection point of the second resistor R2 and the second terminal b rises, exceeding the breakdown voltage of the second voltage-regulating diode ZD2, thereby simultaneously forming two current paths ① and ②: Current path ①: the second current-carrying line, coil Lx, first resistor R1, first voltage-regulating diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; Current path ②: the second current-carrying line, coil Lx, second resistor R2, second voltage-regulating diode ZD2, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 rises, triggering the first switching transistor Q1 to conduct. At this time, the second current-carrying line passes through the coil Lx, the first switching transistor 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.

[0073] In the case of an open circuit in the first shielding conductor structure 110 and / or the second shielding conductor structure 120, there are several open circuit situations, which will be described separately below.

[0074] 1. Refer to Figure 5 As shown, when an open circuit occurs in the second shielding conductor structure 120 between the fourth terminal d and the sixth terminal f, two current paths are formed simultaneously: The first current path is: the second current-carrying line, coil Lx, first resistor R1, first terminal a, third terminal c, sixth terminal f, fifth terminal e, fourth resistor R4, first diode D1, first current-carrying line; The second current path is: the second current-carrying line, coil Lx, second resistor R2, second terminal b, third terminal c, sixth terminal f, fifth terminal e, fourth resistor R4, first diode D1, first current-carrying line; At this time, it is equivalent to an open circuit between the third resistor R3 and the fourth terminal d in the impedance network, causing the voltage at the connection point of the first resistor R1 and the first terminal a to increase and exceed the breakdown voltage of the first voltage-regulating diode ZD1, and the voltage at the connection point of the second resistor R2 and the second terminal b to increase and exceed the breakdown voltage of the second voltage-regulating diode ZD2, thus forming two current paths ① and ② simultaneously: Current path ①: the second current-carrying line, coil Lx, first resistor R1, first voltage-regulating diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; Current path ②: the second current-carrying line, coil Lx, second resistor R2, second voltage-regulating diode ZD2, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 increases, triggering the first switching transistor Q1 to conduct. At this time, the second current-carrying line passes through the coil Lx, the first switching transistor 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.

[0075] 2. Refer to Figure 6 As shown, when an open circuit occurs in the second shielding conductor structure 120 between the sixth terminal f and the fifth terminal e, two current paths are formed simultaneously: The first current path is: the second current-carrying line, coil Lx, first resistor R1, first terminal a, third terminal c, sixth terminal f, fourth terminal d, third resistor R3, first diode D1, first current-carrying line; The second current path is: the second current-carrying line, coil Lx, second resistor R2, second terminal b, third terminal c, sixth terminal f, fourth terminal d, third resistor R3, first diode D1, first current-carrying line; At this time, it is equivalent to that the connection between the fourth resistor R4 and the fifth terminal e in the impedance network is in an open state, causing the voltage at the connection point of the first resistor R1 and the first terminal a to increase and exceed the breakdown voltage of the first voltage regulator diode ZD1, and the voltage at the connection point of the second resistor R2 and the second terminal b to increase and exceed the breakdown voltage of the second voltage regulator diode ZD2, thereby simultaneously forming two current paths ① and ②: Current path ①: The second current-carrying line, coil Lx, first resistor R1, first voltage regulator diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; Current path ②: The second current-carrying line, coil Lx, second resistor R2, second voltage regulator diode ZD2, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 increases, triggering the first switching transistor Q1 to conduct. At this time, the second current-carrying line passes through the coil Lx, the first switching transistor 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.

[0076] 3. Refer to Figure 7 As shown, when the first shielding conductor structure 110 between the first terminal a and the third terminal c is open, two current paths are simultaneously formed: The first current path is: the second current-carrying line, coil Lx, second resistor R2, second terminal b, third terminal c, sixth terminal f, fourth terminal d, third resistor R3, first diode D1, first current-carrying line; The first current path is: the second current-carrying line, coil Lx, second resistor R2, second terminal b, third terminal c, sixth terminal f, fifth terminal e, fourth resistor R4, first diode D1, first current-carrying line; At this time, it is equivalent to that the connection between the first resistor R1 and the first terminal a in the impedance network is in an open state. The voltage of the second current-carrying line is applied to the negative electrode of the first voltage regulator diode ZD1 through the coil Lx and exceeds the breakdown voltage of the first voltage regulator diode ZD1, thereby forming a current path ①: the second current-carrying line, coil Lx, first resistor R1, first voltage regulator diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 increases, triggering the first switching transistor Q1 to conduct. At this time, the second current-carrying line passes through the coil Lx, the first switching transistor 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.

[0077] 4. Refer to Figure 8 As shown, when the first shielding conductor structure 110 between the third terminal c and the second terminal b is open, two current paths are simultaneously formed: The first current path is: the second current-carrying line, coil Lx, first resistor R1, first terminal a, third terminal c, sixth terminal f, fourth terminal d, third resistor R3, first diode D1, first current-carrying line; The second current path is: the second current-carrying line, coil Lx, first resistor R1, first terminal a, third terminal c, sixth terminal f, fifth terminal e, fourth resistor R4, first diode D1, first current-carrying line; At this time, it is equivalent to that the connection between the second resistor R2 and the second terminal b in the impedance network is in an open state. The voltage of the second current-carrying line is applied to the negative electrode of the second voltage-regulating diode ZD2 through the coil Lx, exceeding the breakdown voltage of the second voltage-regulating diode ZD2, thus forming a current path ②: the second current-carrying line, coil Lx, second resistor R2, second voltage-regulating diode ZD2, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 rises, triggering the first switching tube Q1 to conduct. At this time, the second current-carrying line passes through the coil Lx, the first switching 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 enough electromagnetic force to control the switch module 200 to disconnect.

[0078] 5. Refer to Figure 9 As shown in the figure, when the connection between the third terminal c and the sixth terminal f is open, it is equivalent to that the connections between the first resistor R1 and the first terminal a and between the second resistor R2 and the second terminal b in the impedance network are both in an open state. The voltage of the second current-carrying line is applied to the negative electrode of the first voltage-regulating diode ZD1 through the coil Lx, exceeding the breakdown voltage of the first voltage-regulating diode ZD1, and the voltage of the second current-carrying line is applied to the negative electrode of the second voltage-regulating diode ZD2 through the coil Lx, exceeding the breakdown voltage of the second voltage-regulating diode ZD2, simultaneously forming two current paths ① and ②: Current path ①: the second current-carrying line, coil Lx, first resistor R1, first voltage-regulating diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; Current path ②: the second current-carrying line, coil Lx, second resistor R2, second voltage-regulating diode ZD2, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 rises, triggering the first switching tube Q1 to conduct. At this time, the second current-carrying line passes through the coil Lx, the first switching 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 enough electromagnetic force to control the switch module 200 to disconnect.

[0079] Refer to Figure 10 As shown in the figure, when the test switch TEST is closed, two current paths are simultaneously formed: The first current path is: the second current-carrying line, coil Lx, test switch TEST, first terminal a, third terminal c, sixth terminal f, fourth terminal d, third resistor R3, first diode D1, first current-carrying line; The second current path is: the second current-carrying line, coil Lx, test switch TEST, first terminal a, third terminal c, sixth terminal f, fifth terminal e, fourth resistor R4, first diode D1, first current-carrying line; The test switch TEST shorts the first resistor R1, and at the same time in the impedance network, the second resistor R2 is shorted. The voltage of the second current-carrying line is applied to the negative electrode of the first voltage-regulating diode ZD1 through the coil Lx, exceeding the breakdown voltage of the first voltage-regulating diode ZD1. The voltage of the second current-carrying line is applied to the negative electrode of the second voltage-regulating diode ZD2 through the coil Lx, exceeding the breakdown voltage of the second voltage-regulating diode ZD2, thereby simultaneously forming two current paths ① and ②: Current path ①: the second current-carrying line, coil Lx, first resistor R1, first voltage-regulating diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; Current path ②: the second current-carrying line, coil Lx, second resistor R2, second voltage-regulating diode ZD2, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line; The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 rises, triggering the first switching transistor Q1 to conduct. At this time, the second current-carrying line passes through the coil Lx, the first switching transistor Q1 and the first diode D1 to the first current-carrying line, and the current flowing through the coil Lx is large enough, so as to generate enough electromagnetic force to control the switch module 200 to disconnect.

[0080] Referring to Figure 11 , in the second aspect embodiment of the present application, an electrical connection device 800 is provided, including the detection and protection device 300 as described in any of the above embodiments, a housing 810, and a power cord 100. The power cord 100 is connected to the housing 810, and the detection and protection device 300 is disposed in the housing 810.

[0081] In addition, in the third aspect embodiment of the present application, an electrical equipment is provided, including a load device and the electrical connection device 800 as described in the above embodiment. The output end of the power cord 100 is connected to the load device.

[0082] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above embodiments. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present application, and 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 cord, characterized in that, the power cord includes a first current-carrying line and a second current-carrying line, and the power cord further includes 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 includes a first end near the input end of the power cord, a second end near the output end of the power cord, and a third end between the first end and the second end. The second shielding conductor structure includes a fourth end near the input end of the power cord, a fifth end near the output end of the power cord, and a sixth end between the fourth end and the fifth end; the third end and the sixth end are connected; the detection and protection device includes: a switch module for controlling the electrical connection between the input end and the output end of the power cord; a first detection module configured to generate a first open-circuit signal when an open circuit occurs in the first shielding conductor structure and / or the second shielding conductor structure; a second detection module configured to generate a second open-circuit signal when an open circuit occurs in the first shielding conductor structure and / or the second shielding conductor structure; a drive module configured to control the switch module to disconnect the electrical connection between the input end and the output end of the power cord when the first open-circuit signal, the second open-circuit signal, or a leakage signal of the first shielding conductor structure or the second shielding conductor structure is detected.

2. The detection and protection device according to claim 1, characterized in that, the first detection module is further configured to generate the first open-circuit signal when an open circuit occurs at at least one of the following positions: the second shielding conductor structure between the fourth end and the sixth end; the first shielding conductor structure between the first end and the third end; the second shielding conductor structure between the fifth end and the sixth end; the connection between the third end and the sixth end; the second detection module is further configured to generate the second open-circuit signal when an open circuit occurs at at least one of the following positions: the second shielding conductor structure between the fifth end and the sixth end; the first shielding conductor structure between the second end and the third end; the second shielding conductor structure between the fourth end and the sixth end; the 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 first detection module includes a first impedance element, the first end is connected to the second current-carrying line through the first impedance element, the second detection module includes a second impedance element, the second end is connected to the second current-carrying line through the second impedance element, a first connection end of the drive module is connected to the connection point of the first impedance element and the first end, a second connection end of the drive module is connected to the connection point of the second impedance element and the second end, and a third connection end of the drive module is connected to the first current-carrying line.

4. The detection and protection device according to claim 3, characterized in that, The detection and protection device further includes a third impedance element and a fourth impedance element. The fourth terminal is connected to the first current-carrying line through the third impedance element, and the fifth terminal is connected to the first current-carrying line through the fourth impedance element; In the case of an open circuit occurring in the second shield conductor structure between the fourth terminal and the sixth terminal, the first impedance element is configured to cooperate with the fourth impedance element to generate the first open-circuit signal, and the second impedance element is configured to cooperate with the fourth impedance element to generate the second open-circuit signal; In the case of an open circuit occurring in the second shield conductor structure between the fifth terminal and the sixth terminal, the first impedance element is configured to cooperate with the third impedance element to generate the first open-circuit signal, and the second impedance element is configured to cooperate with the third impedance element to generate the second open-circuit signal; In the case of an open circuit occurring in the first shield conductor structure between the first terminal and the third terminal, the first impedance element is configured to generate the first open-circuit signal; In the case of an open circuit occurring in the first shield conductor structure between the second terminal and the third terminal, the second impedance element is configured to generate the second open-circuit signal; In the case of an open circuit occurring in the connection between the third terminal and the sixth terminal, the first impedance element is configured to generate the first open-circuit signal, and the second impedance element is configured to generate the second open-circuit signal.

5. The detection and protection device according to claim 4, wherein, The drive module includes a fifth impedance element, a sixth impedance element, a first zener diode, and a second zener diode. One end of the fifth impedance element is connected to the connection point of the third impedance element and the fourth impedance element. The other end of the fifth impedance element is connected to the positive electrodes of the first zener diode and the second zener diode through the sixth impedance element. The negative electrode of the first zener diode is connected to the connection point of the first impedance element and the first terminal, and the negative electrode of the second zener diode is connected to the connection point of the second impedance element and the second terminal.

6. The detection and protection device according to claim 5, wherein, The detection and protection device further includes a switch trip drive unit. The switch trip 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.

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

8. The detection and protection device according to claim 7, wherein, The switch trip driving unit further includes a first diode and a second diode; the positive electrode of the first diode, the positive electrode of the second diode, and one switching pin of the first switching tube are all connected to the connection point of the third impedance element and the fourth impedance element; the negative electrode of the first diode is connected to the first current-carrying line; the negative electrode of the second diode and the other switching pin of the first switching tube are both connected to one end of the coil, and the other end of the coil is connected to the second current-carrying line.

9. The detection and protection device according to claim 6, wherein, the detection and protection device further includes a test module configured to short-circuit the first detection module and / or the second detection module after being triggered.

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

11. The detection and protection device according to claim 6, wherein, it further includes a lightning protection module, one end of the lightning protection module 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.

12. The detection and protection device according to claim 6, wherein, it further includes an LED indication unit connected in parallel with the switch unit, and the LED indication unit includes a seventh impedance element and a light-emitting diode connected in series.

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

14. An electrical equipment, wherein, it includes a load device and the electrical connection device according to claim 13, and the output end of the power cord is connected to the load device.

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