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 first detection module can generate a first open-circuit signal, the second detection module can generate a second open-circuit signal, the first driving module can control the switch module to disconnect power connection between the input end and the output end of the power line when detecting the first open-circuit signal or the electric leakage signal, and the second driving module can control the switch module to disconnect power connection between the input end and the output end of the power line when detecting the second open-circuit signal or the electric leakage signal. According to the invention, the switch module can be controlled to disconnect the power connection between the input end and the output end of the power line, that is to say, when 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

[0001] This application claims priority to four Chinese patent applications filed on August 31, 2023: application number "202311122754X", application name "power cord, power cord detection and protection device, electrical connection equipment and electrical equipment", application number "2023223725448", application name "power cord, power cord detection and protection device, electrical connection equipment and electrical equipment", application number "2023111227287", application name "power cord detection and protection device, electrical connection equipment and electrical equipment" and application number "2023223725306", application name "power cord detection and protection device, 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 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;

[0010] A second detection module 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] A first driving module is configured to control the switch module to disconnect the power connection between the input end and the output end of the power line when the first open circuit signal is detected or the leakage signal of the first shielding layer conductor structure or the second shielding conductor structure is detected;

[0012] The second driving module is configured to control the switch module to disconnect the power connection between the input end and the output end of the power line when the second open circuit signal is detected or the leakage signal of the first shielding layer conductor structure or the second shielding conductor structure is detected.

[0013] 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:

[0014] a first shielding conductor structure between the first end and the third end;

[0015] a second shielding conductor structure between the fourth end and the sixth end;

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

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

[0018] 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:

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

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

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

[0022] A connection between the third end and the sixth end.

[0023] In some embodiments, the first detection module includes a first impedance element, the fourth end is connected to the second current-carrying line through the first impedance element, one end of the first driving module is connected to the connection point between the first impedance element and the fourth end, and the other end of the first driving module is connected to the first current-carrying line; the second detection module includes a second impedance element, the fifth end is connected to the second current-carrying line through the second impedance element, one end of the second driving module is connected to the connection point between the second impedance element and the fifth end, and the other end of the second driving module is connected to the first current-carrying line.

[0024] In some embodiments, the detection protection device further includes a third impedance element and a fourth impedance element, the first end is connected to the first current-carrying line through the third impedance element, and the second end is connected to the first current-carrying line through the fourth impedance element;

[0025] In the case where an open circuit occurs in the first shielded conductor structure between the first end and the third end, the first impedance element is configured to 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;

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

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

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

[0029] When an open circuit occurs at the connection between the third terminal and the sixth terminal, the first impedance element is configured to generate the first open circuit signal, and the second impedance element is configured to generate the second open circuit signal.

[0030] In some embodiments, the first driving module includes a fifth impedance element, a sixth impedance element and a first Zener diode connected in sequence, the fifth impedance element is connected to the connection point between the third impedance element and the fourth impedance element, and the cathode of the first Zener diode is connected to the connection point between the first impedance element and the fourth end; the second driving module includes a seventh impedance element, an eighth impedance element and a second Zener diode connected in sequence, the seventh impedance element is connected to the connection point between the third impedance element and the fourth impedance element, and the cathode of the second Zener diode is connected to the connection point between the second impedance element and the fifth end.

[0031] In some embodiments, the detection and protection device also includes a switch tripping drive unit, which includes a switch unit and a coil for generating an electromagnetic force to drive the switch module. The second current-carrying line, the coil, the switch unit and the first current-carrying line are connected in sequence so that when the switch unit is turned on, the electromagnetic force of the coil is used to control the switch module to disconnect the power connection between the input and output ends of the power line.

[0032] In some embodiments, the switching unit includes a first switching tube and a second switching tube, the connection point of the fifth impedance element and the sixth impedance element is connected to the control pin of the first switching tube, 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.

[0033] 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.

[0034] 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.

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

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

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

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

[0039] In some embodiments, a lightning protection module is further included, one end of which is connected to the first current-carrying line, and the other end of which is respectively connected to the second current-carrying line and one end of the coil.

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

[0041] In a second aspect, an embodiment of the present application provides an electrical connection device, comprising a 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.

[0042] In a third aspect, an embodiment of the present application provides an electrical device, comprising a load device and the electrical connection device described in the second aspect, wherein the output end of the power line is connected to the load device.

[0043] The detection and protection device, electrical connection device and electrical equipment of the power line of the embodiment of the present application have at least the following beneficial effects: in the power line, the first shielded conductor structure between the first end and the third end, the first shielded conductor structure between the third end and the second end, the second shielded conductor structure between the fourth end and the sixth end, the second shielded conductor structure between the sixth end and the fifth end, and the conductor structure between the third end and the sixth end, any of the above conductor structures can be used to detect open circuits and conduct leakage signals; when the first shielded conductor structure and / or the second shielded conductor structure is open-circuited, the first detection module can generate a first open-circuit signal, and the second detection module can generate a second open-circuit signal. When the first drive module detects the first open-circuit signal or the leakage signal, it can control the switch module to disconnect the power connection between the input end and the output end of the power line. When the second drive module detects the second open-circuit signal or the leakage signal, it can control the switch module to disconnect the power connection between the input end and the output end of the power line. In the above manner, when the integrity of the first shielded conductor structure and / or the second shielded conductor structure is destroyed, that is, when an open circuit occurs, the corresponding open-circuit signal can be used to trigger the disconnection of the power connection of the power line, thereby ensuring power safety.

[0044] 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

[0045] Figure 1 It is a schematic diagram of module connection of the detection and protection device provided in an embodiment of the present application;

[0046] Figure 2 is a circuit diagram of a detection and protection device provided in an embodiment of the present application;

[0047] 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;

[0048] Figure 4 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 in an embodiment of the present application;

[0049] Figure 5 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;

[0050] Figure 6 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;

[0051] Figure 7 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;

[0052] Figure 8 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;

[0053] Fig. 9 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;

[0054] Fig.10 is a schematic diagram of current flow when the test switch provided in an embodiment of the present application is closed; Fig.11 It is a schematic diagram of the structure of the electrical connection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below 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.

[0056] 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.

[0057] 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).

[0058] 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.

[0059] 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, and the first end, the second end, the fourth end, and the fifth end are used to connect to the detection and protection device. The detection and protection device is configured with a first detection module and a second detection module, which are respectively used to detect the open circuit 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 first drive module and the second drive module in the detection and protection device receive 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.

[0060] 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.

[0061] 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;

[0062] The detection and protection device 300 comprises:

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

[0064] The first detection module 310 is configured to generate a first open circuit signal when the first shielding conductor structure 110 and / or the second shielding conductor structure 120 is open circuited;

[0065] The second detection module 320 is configured to generate a second open circuit signal when the first shielding conductor structure 110 and / or the second shielding conductor structure 120 is open circuited;

[0066] The first 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 detecting a first open circuit signal or a leakage signal of the first shielding layer conductor structure or the second shielding conductor structure 120;

[0067] The second driving module 340 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 a second open circuit signal is detected or a leakage signal of the first shielding layer conductor structure or the second shielding conductor structure 120 is detected.

[0068] 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 shielding conductor structure 110, and the second current-carrying line is wrapped by a second shielding conductor structure 120. An insulating skin of the first current-carrying line is provided between the first current-carrying line and the first shielding conductor structure 110, and an insulating skin of the second current-carrying line is provided between the second current-carrying line and the second shielding conductor structure 120. In the case where leakage current occurs, after the insulating skin on the surface of the first current-carrying line is damaged, when the first current-carrying line contacts the first shielding conductor structure 110 so that leakage current occurs in the first shielding conductor structure 110, the leakage signal of the leakage current can be detected by the first driving module 330 and the second driving module 340, thereby triggering the disconnection of the switch module 200. Similarly, after the insulating skin on the surface of the second current-carrying line is damaged, when the second current-carrying line contacts the second shielding conductor structure 120 so that leakage current occurs in the second shielding conductor structure 120, the leakage signal of the leakage current can be detected by the first driving module 330 and the second driving module 340, thereby triggering the disconnection. Switch module 200; when an open circuit occurs, an open circuit occurs on the first shielding conductor structure 110, and the first detection unit and the second detection unit can both generate corresponding open circuit signals, so that the first driving module 330 detects the first open circuit signal and the second driving module 340 detects the second open circuit signal, thereby triggering the disconnection of the switch module 200. Similarly, when an open circuit occurs on the second shielding conductor structure 120, the first detection unit and the second detection unit can both generate corresponding open circuit signals, so that the first driving module 330 detects the first open circuit signal and the second driving module 340 detects the second open circuit signal, thereby triggering the disconnection of the switch module 200.

[0069] On the power line 100, the first end a of the first shielded conductor structure 110 can be connected to the detection and protection device 300 through the first wire 410, the second end b can be connected to 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 detection and protection device 300 through the second wire 420, and the fifth end e can be connected to 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 detection module 310, the second detection module 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.

[0070] 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 detection module 310 is also configured to generate a first open circuit signal when an open circuit occurs at at least one of the following positions:

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

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

[0073] A first shielding conductor structure 110 between the second end b and the third end c;

[0074] A connection between the third terminal c and the sixth terminal f;

[0075] It can be seen from this that the first open circuit signal of the first detection module 310 is generated when an open circuit occurs at any of the four corresponding positions mentioned above; in the case where an open circuit occurs at the above four positions, the first driving module 330 triggers the control switch module 200 to disconnect the power connection between the input and output ends of the power line 100 through the first open circuit signal.

[0076] 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:

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

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

[0079] A first shielding conductor structure 110 between the first end a and the third end c;

[0080] A connection between the third terminal c and the sixth terminal f.

[0081] 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-mentioned four corresponding 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-mentioned four corresponding positions; in response to the open circuit occurring at the above-mentioned four positions, the second driving module 340 triggers the control switch module 200 to disconnect the power connection between the input and output ends of the power line 100 through the second open circuit signal.

[0082] 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.

[0083] The specific circuit structure of the detection and protection device 300 is described below by way of example.

[0084] Reference Figure 2 As shown, in some embodiments, the first detection module 310 includes a first impedance element, the fourth end d is connected to the second current-carrying line through the first impedance element, one end of the first driving module 330 is connected to the connection point between the first impedance element and the fourth end d, and the other end of the first driving module 330 is connected to the first current-carrying line; the second detection module 320 includes a second impedance element, the fifth end e is connected to the second current-carrying line through the second impedance element, one end of the second driving module 340 is connected to the connection point between the second impedance element and the fifth end e, and the other end of the second driving module 340 is connected to the first current-carrying line.

[0085] For the convenience of explanation, in this embodiment, the first impedance element is Figure 2 The first resistor R1 is represented in the figure, and the second impedance element is 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.

[0086] One end of the first resistor R1 is connected to the second current-carrying line, the other end of the first resistor R1 is connected to the fourth end d and the first driving module 330, one end of the second resistor R2 is connected to the second current-carrying line, the other end of the second resistor R2 is connected to the fifth end e and the second driving module 340, so the first resistor R1 and the second resistor R2 are both connected to the second current-carrying line, the current of the second current-carrying line passes through the first resistor R1 to the first driving module 330 and the fourth end d, and also passes through the second resistor R2 to the second driving module 340 and the fifth end e. Since the fourth end d and the fifth end e are both located in the second shielding conductor structure 120, and the second shielding conductor structure 120 is also conductively connected to the third end c of the first shielding conductor structure 110 through the sixth end f, and the third end c of the first shielding conductor structure 110 is connected to the first end a and the second end b, so 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 first driving module 330 and the second driving module 340 are also connected to the first shielding conductor structure 110 and the second shielding conductor structure 120. It can be seen that when an open circuit occurs on the first shielded conductor structure 110 and the second shielded conductor structure 120, the current conditions of the first shielded conductor structure 110 and the second shielded conductor structure 120 change; at this time, the current flowing through the first resistor R1 changes, and the current change corresponds to the first open circuit signal, thereby triggering the first drive module 330. Similarly, the current flowing through the second resistor R2 changes, and the current change corresponds to the second open circuit signal, thereby triggering the second drive module 340, thereby realizing open circuit detection of the shielded line.

[0087] Reference Figure 2 As shown, in some embodiments, the detection protection device 300 further includes a third impedance element and a fourth impedance element, the first end a is connected to the first current-carrying line through the third impedance element, and the second end b is connected to the first current-carrying line through the fourth impedance element;

[0088] When an open circuit occurs in the first shielded conductor structure 110 between the first end a and the third end c, 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;

[0089] When an open circuit occurs in the first shielded conductor structure 110 between the second end b and the third end c, 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;

[0090] In the case that the second shielding conductor structure 120 between the fourth end d and the sixth end f is open-circuited, the first impedance element is configured to generate a first open-circuit signal;

[0091] In the case that an open circuit occurs in the second shielding conductor structure 120 between the fifth end e and the sixth end f, the second impedance element is configured to generate a second open circuit signal;

[0092] In the case where the connection between the third terminal c and the sixth terminal f is open-circuited, 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.

[0093] For the convenience of explanation, the third impedance element in this embodiment is Figure 2 The third resistor R3 is represented in Figure 2 It is represented as the fourth resistor R4; 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 connected in series, in parallel, or in series and parallel. The third resistor R3 and the fourth resistor R4 can also be other voltage drop elements and combinations thereof, such as inductors, capacitors, or any combination of capacitors, inductors and resistors.

[0094] One end of the third resistor R3 is connected to the first current-carrying line, the other end of the third resistor R3 is connected to the 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; 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.

[0095] It can be seen that when the first shielding conductor structure and / or the second shielding conductor structure is open-circuited, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 cooperate to generate an open-circuit signal to achieve open-circuit detection, specifically:

[0096] 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 first resistor R1, the fourth end d, the sixth end f, the third end c, the first end a 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 first driving module 330. At the same time, the second current-carrying line, the second resistor R2, the fifth end e, the sixth end f, the third end c, the first end a 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 second driving module 340.

[0097] 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 second resistor R2, the fifth end e, the sixth end f, the third end c, the second end b and the fourth resistor R4 form a current path, and the current on the second resistor R2 and the fourth resistor R4 changes, that is, the second resistor R2 cooperates with the fourth resistor R4 to generate a second open-circuit signal corresponding to the current change, thereby triggering the second driving module 340. At the same time, the second current-carrying line, the first resistor R1, the fourth end d, the sixth end f, the third end c, the second end b and the fourth resistor R4 form a current path, and the current on the first resistor R1 and the fourth resistor R4 changes, that is, the first resistor R1 cooperates with the fourth resistor R4 to generate a first open-circuit signal corresponding to the current change, thereby triggering the first driving module 330.

[0098] When the second shielding conductor structure 120 between the fourth end d and the sixth end f is open-circuited, that is, the connection between the first resistor R1 and the fourth end d is open-circuited, the voltage of the first resistor R1 increases, thereby generating a first open-circuit signal to the first driving module 330, thereby triggering the first driving module 330;

[0099] When the second shielding conductor structure 120 between the fifth end e and the sixth end f is open-circuited, that is, the connection between the second resistor R2 and the fifth end e is open-circuited, the voltage of the second resistor R2 increases, thereby generating a second open-circuit signal to the second driving module 340, thereby triggering the second driving module 340;

[0100] When the connection between the third end c and the sixth end f is open, that is, the connection between the first resistor R1 and the fourth end d is open, and the connection between the second resistor R2 and the fifth end e is open, the voltage of the first resistor R1 increases, thereby generating a first open-circuit signal to trigger the first driving module 330, and the voltage of the second resistor R2 increases, thereby generating a second open-circuit signal to trigger the second driving module 340.

[0101] Reference Figure 2 As shown, in some embodiments, the first driving module 330 includes a fifth impedance element, a sixth impedance element and a first Zener diode ZD1 connected in sequence, the fifth impedance element is connected to the connection point of the third impedance element and the fourth impedance element, and the cathode of the first Zener diode ZD1 is connected to the connection point of the first impedance element and the fourth end d; the second driving module 340 includes a seventh impedance element, an eighth impedance element and a second Zener diode ZD2 connected in sequence, the seventh impedance element is connected to the connection point of the third impedance element and the fourth impedance element, and the cathode of the second Zener diode ZD2 is connected to the connection point of the second impedance element and the fifth end e.

[0102] For the convenience of explanation, the fifth impedance element in this embodiment is Figure 2 The fifth resistor R5 is represented in FIG. Figure 2 The sixth resistor R6 is represented in Figure 2 The seventh resistor R7 is represented in Figure 2 It is represented as the eighth resistor R8; it can be understood that the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 can be a single resistor element, or a resistor network composed of multiple resistors connected in series, in parallel, or in series and parallel. The fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 can also be other voltage drop elements and combinations thereof, such as inductors, capacitors, or any combination of capacitors, inductors and resistors.

[0103] The fifth resistor R5 and the seventh resistor R7 are both connected to the first current-carrying line and are connected to the connection point of the third resistor R3 and the fourth resistor R4, and the first voltage-stabilizing diode ZD1 is connected to the connection point of the first resistor R1 and the fourth end d, and the second voltage-stabilizing diode ZD2 is connected to the connection point of the second resistor R2 and the fifth end e. Then, the second current-carrying line connects the first resistor R1 and the second resistor R2 respectively, and then passes through the first shielding conductor structure 110 and the second shielding conductor structure 120 and the third resistor R3 and the fourth resistor R4 to the first current-carrying line. If 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 first driving module 330 and the second driving module 340. At this time, the first driving module 330 receives the first open-circuit signal through the first voltage-stabilizing 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 second driving module 340 receives the second open-circuit signal through the second voltage-stabilizing diode ZD2, and can also receive the leakage signal from the first shielding conductor structure 110 and / or the second shielding conductor structure 120.

[0104] It can be understood that, when there is no leakage current and no open circuit in the first shielded conductor structure 110 and the second shielded 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 between the first resistor R1 and the fourth end d does not exceed the breakdown voltage of the first voltage zener diode ZD1, and the voltage at the connection point between the second resistor R2 and the fifth end e does not exceed the breakdown voltage of the second voltage zener diode ZD2. At this time, the detection and protection device 300 does not affect the normal operation of the power line 100. When leakage current occurs in the above impedance network, or the first shielded conductor structure 110 and / or the second shielded conductor structure 120 have an open circuit, the voltage on the impedance network changes accordingly, which will cause the first voltage zener diode ZD1 and / or the second voltage zener diode ZD2 to break down, thereby triggering the first driving module 330 and / or the second driving module 340 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.

[0105] Reference Figure 2 As shown, in some embodiments, the detection and protection device 300 also includes a switch tripping drive unit 350, which includes a switch unit and a coil Lx for generating an electromagnetic force to drive the switch module 200. The second current-carrying line, the coil Lx, the switch unit, and the first current-carrying line are connected in sequence to control the switch module 200 to disconnect the power connection between the input end and the output end of the power line 100 by using the electromagnetic force of the coil Lx when the switch unit is turned on.

[0106] 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 drive unit 350 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 directly controlled to be turned on by the first drive module 330 and the second drive module 340, or it can be indirectly controlled to be turned on by the control chip, the trigger circuit, etc. when the first drive module 330 receives the first open circuit signal or the leakage signal and the second drive module 340 receives the second open circuit signal or the leakage signal. 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.

[0107] 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.

[0108] In this embodiment, the first driving module 330 and the second driving module 340 are used to directly control the conduction switch unit, and the first driving module 330 and the second driving module 340 are respectively configured with a first switch tube Q1 and a second switch tube Q2. In the first 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 shutdown of the first switch tube Q1. When the first driving module 330 receives a first open circuit signal or a leakage signal, the voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 increases, and the first switch tube Q1 can be turned on, thereby controlling the switch module 200 to be disconnected; similarly, in the second driving module 340, the voltage at the connection point of the seventh resistor R7 and the eighth resistor R8 is used to control the conduction and shutdown of the second switch tube Q2. When the second driving module 340 receives a second open circuit signal or a leakage signal, the voltage at the connection point of the seventh resistor R7 and the eighth resistor R8 increases, and the second switch tube Q2 can be turned on, thereby controlling the switch module 200 to be disconnected.

[0109] Reference Figure 2 As shown, in some embodiments, the switch tripping drive unit 350 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.

[0110] 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. The first diode D1 limits the current so that it can only pass through the first switch tube Q1 from the second current-carrying line to the first current-carrying line when the first switch tube Q1 is turned on, and also limits the current so that it can only pass through the second switch tube Q2 from the second current-carrying line to the first current-carrying line when the second switch tube Q2 is turned on; when the first voltage-stabilizing diode ZD1 is broken down, the second current-carrying line, the coil Lx, the first resistor R1, the first voltage-stabilizing diode ZD1, the sixth resistor R6, the fifth resistor R5, the first diode D1, and the first current-carrying line form a path; when the second voltage-stabilizing diode ZD2 is broken down, the second current-carrying line, the coil Lx, the second resistor R2, the second voltage-stabilizing diode ZD2, the eighth resistor R8, the seventh resistor R7, the first diode D1, and the first current-carrying line form a path.

[0111] 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.

[0112] The first capacitor C1 is connected in parallel with the fifth resistor R5, and the second capacitor C2 is connected in parallel with the seventh resistor R7. When the first voltage zener diode ZD1 is broken down, the voltage at the connection point between the fifth resistor R5 and the sixth resistor R6 increases, the first capacitor C1 is charged and the voltage of the control pin of the first switch tube Q1 gradually increases, and then reaches the turn-on voltage; when the second voltage zener diode ZD2 is broken down, the voltage at the connection point between the seventh resistor R7 and the eighth resistor R8 increases, the second capacitor C2 is charged and the voltage of the control pin of the second switch tube Q2 gradually increases, and then reaches the turn-on voltage. By setting the first capacitor C1 and the second capacitor C2, it is possible to avoid large currents directly impacting the first switch tube Q1 and the second switch tube Q2.

[0113] 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, thereby increasing the voltage applied to the cathode of the first voltage-conducting diode ZD1 and the cathode of the second voltage-conducting diode ZD2. If the voltage exceeds the breakdown voltage of the first voltage-conducting diode ZD1, the first switch tube Q1 is triggered to turn on, and if the voltage exceeds the breakdown voltage of the second voltage-conducting diode ZD2, the second switch tube Q2 is triggered to turn on, thereby triggering the switch release drive unit 350 to control 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 protection device of the embodiment of the present application is not only suitable for triggering the tripping when the shielding layer is open-circuited and leakage current occurs, but also suitable for triggering the tripping when the voltage of the current-carrying line fluctuates, thereby realizing the overvoltage protection function of the current-carrying line.

[0114] 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 first detection module 310 and / or the second detection module 320 after being triggered. The test module provides a test function to the user, which is used for, after the test module is activated, if the LCDI device can disconnect the power connection between the power cord 100, it indicates that the LCDI device is normal inside. The test module of this embodiment has a certain connection relationship with 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 causes the first detection module 310 to be short-circuited, the second current-carrying line is directly connected to the sixth terminal f after passing through the coil Lx and the branch where the test module is located. Since the second detection module 320 is also connected to the sixth terminal f, the second detection module 320 is also short-circuited, causing the voltage of the cathode of the first voltage-stabilizing diode ZD1 and the cathode of the second voltage-stabilizing diode ZD2 to rise, and the first voltage-stabilizing diode ZD1 and the second voltage-stabilizing diode ZD2 are broken down, 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. Similarly, when the test module causes the second detection module 320 to be short-circuited, the second streamline passes through the coil Lx and the branch where the test module is located and is directly connected to the sixth end f. Since the first detection module 310 is also connected to the sixth end f, the first detection module 310 is also short-circuited, causing the voltage of the cathode of the first Zener diode ZD1 and the cathode of the second Zener diode ZD2 to rise, and the first Zener diode ZD1 and the second Zener diode ZD2 are broken down, and then the first switch tube Q1 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.

[0115] Specifically, the test module includes a test switch TEST, a first impedance element and a second impedance element connected to a second current-carrying line through a coil Lx;

[0116] The test switch TEST is connected in parallel with the first impedance element or the second impedance element;

[0117] 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 .

[0118] The test switch TEST is connected in parallel at both ends of the first resistor R1 or the second resistor R2. When the test switch TEST is closed, the first resistor R1 or the second resistor R2 is short-circuited. According to the above analysis, the second resistor R2 and the first resistor R1 are short-circuited, which can trigger the first voltage regulator diode ZD1 and the second voltage regulator diode ZD2 to be broken down, and then the first switch tube Q1 and the second switch tube Q2 are turned on, and finally the coil Lx generates 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 first resistor R1. 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 of the cathode of the first Zener diode ZD1 and the cathode of the second Zener diode ZD2 to rise, and the first Zener diode ZD1 and the second Zener diode ZD2 are broken down, and then the first switch tube Q1 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.

[0119] 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 the first resistor R1 and the second resistor R2 are both connected to the sixth end f, this setting of the test switch TEST is actually connected in parallel with the first resistor R1 and the second resistor R2. Because the points on the first shielding conductor structure 110 and the second shielding conductor structure 120 are equipotential, when the test switch TEST is closed, the first resistor R1 and the second resistor R2 are actually short-circuited, and the first Zener diode ZD1 and the second Zener diode ZD2 can also be triggered to be broken down, so that the coil Lx generates a sufficiently large electromagnetic force to control the switch module 200 to disconnect.

[0120] 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 350, 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 350 from having a large instantaneous current and shocking the circuit elements.

[0121] 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 a ninth 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 ninth impedance element is connected in series. Figure 2 It is represented as a series connection of a ninth resistor R9 and a tenth resistor R10; it can be understood that the ninth resistor R9 and the tenth resistor R10 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 ninth resistor R9 and the tenth resistor R10 can also be other voltage drop elements and combinations thereof, such as inductors, capacitors, or any combination of capacitors, inductors and resistors.

[0122] 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.

[0123] The detection protection device 300 of the embodiment of the present application is described in detail below through a specific example.

[0124] Reference Figure 2 The circuit diagram of the detection protection device 300 is shown.

[0125] 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.

[0126] The detection and 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 and protection device 300 includes a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, wherein one end of the first resistor R1 and one end of the second resistor R2 are both connected to the second current-carrying line through a coil Lx, the other end of the first resistor R1 is connected to the cathode of the first voltage-stabilizing diode ZD1 in the first driving module 330, the other end of the first resistor R1 is also connected to the fourth end d, the other end of the second resistor R2 is connected to the cathode of the second voltage-stabilizing diode ZD2 in the second driving module 340, and the other end of the second resistor R2 is also connected to the fifth end e; 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 a first diode D1, the other end of the third resistor R3 is connected to the first end a, and the other end of the fourth resistor R4 is connected to the second end b.

[0127] The first driving module 330 includes a fifth resistor R5, a sixth resistor R6 and a first voltage stabilizing diode ZD1 connected in series, and the second driving module 340 includes a seventh resistor R7, an eighth resistor R8 and a second voltage stabilizing diode ZD2 connected in series. The fifth resistor R5 and the seventh resistor R7 are both 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 the control voltage to the switch tripping driving unit 350, and the connection point of the seventh resistor R7 and the eighth resistor R8 is also used to output the control voltage to the switch tripping driving unit 350.

[0128] The switch tripping driving unit 350 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 a fifth resistor R5 and a sixth resistor R6, and a control pin of the second switch tube Q2 is connected to a connection point between a seventh resistor R7 and an eighth resistor R8. 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 a third resistor R3 and a fourth resistor R4, and the other switch pin is connected to a connection point between the first resistor R1 and the second resistor R2.

[0129] The detection protection device 300 further includes a test switch TEST, and the test switch TEST is connected in parallel with the first resistor R1.

[0130] 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.

[0131] Reference Figure 3As 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:

[0132] The first current path is the second current-carrying line, the coil Lx, the first resistor R1, 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;

[0133] The second current path is the second current-carrying line, the coil Lx, the first resistor R1, the fourth terminal d, the sixth terminal f, the third terminal c, the second terminal b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0134] The third current path is the second current-carrying line, the coil Lx, the second resistor R2, 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 second resistor R2, 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;

[0136] Since the first resistor R1, the second resistor R2, 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 fourth end d does not exceed the breakdown voltage of the first Zener diode ZD1, and the voltage at the connection point between the second resistor R2 and the fifth end e does not exceed the breakdown voltage of the second Zener diode ZD2.

[0137] 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 fourth end d increases, exceeding the breakdown voltage of the first Zener diode ZD1, and the voltage at the connection point between the second resistor R2 and the fifth end e increases, exceeding the breakdown voltage of the second Zener diode ZD2, thereby forming two current paths ① and ② at the same time:

[0138] Current path ①: second current-carrying line, coil Lx, first resistor R1, first voltage-stabilizing diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0139] Current path ②: second current-carrying line, coil Lx, second resistor R2, second voltage-stabilizing diode ZD2, eighth resistor R8, seventh resistor R7, first diode D1, first current-carrying line;

[0140] The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 increases, triggering the first switch tube Q1 to turn on. At this time, the second current-carrying line passes through the coil Lx, the first switch tube Q1 and the first diode D1 to the first current-carrying line, 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 seventh resistor R7 and the eighth resistor R8 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.

[0141] 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.

[0142] 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, two current paths are formed at the same time:

[0143] The first current path is the second current-carrying line, the coil Lx, the first resistor R1, 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;

[0144] The second current path is the second current-carrying line, the coil Lx, the second resistor R2, 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;

[0145] At this time, it is equivalent to that the connection between the third resistor R3 and the first end a in the impedance network is in an open circuit state, so that the voltage at the connection point between the first resistor R1 and the fourth end d increases, exceeding the breakdown voltage of the first Zener diode ZD1, and the voltage at the connection point between the second resistor R2 and the fifth end e increases, exceeding the breakdown voltage of the second Zener diode ZD2, thereby forming two current paths ① and ② at the same time:

[0146] Current path ①: second current-carrying line, coil Lx, first resistor R1, first voltage-stabilizing diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0147] Current path ②: second current-carrying line, coil Lx, second resistor R2, second voltage-stabilizing diode ZD2, eighth resistor R8, seventh resistor R7, first diode D1, first current-carrying line;

[0148] The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 increases, triggering the first switch tube Q1 to turn on. At this time, the second current-carrying line passes through the coil Lx, the first switch tube Q1 and the first diode D1 to the first current-carrying line, 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 seventh resistor R7 and the eighth resistor R8 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.

[0149] 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, two current paths are formed at the same time:

[0150] The first current path is the second current-carrying line, the coil Lx, the first resistor R1, 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;

[0151] The second current path is the second current-carrying line, the coil Lx, the second resistor R2, 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;

[0152] At this time, it is equivalent to that the connection between the fourth resistor R4 and the second end b in the impedance network is in an open circuit state, so that the voltage at the connection point between the first resistor R1 and the fourth end d increases, exceeding the breakdown voltage of the first Zener diode ZD1, and the voltage at the connection point between the second resistor R2 and the fifth end e increases, exceeding the breakdown voltage of the second Zener diode ZD2, thereby forming two current paths ① and ② at the same time:

[0153] Current path ①: second current-carrying line, coil Lx, first resistor R1, first voltage-stabilizing diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0154] Current path ②: second current-carrying line, coil Lx, second resistor R2, second voltage-stabilizing diode ZD2, eighth resistor R8, seventh resistor R7, first diode D1, first current-carrying line;

[0155] The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 increases, triggering the first switch tube Q1 to turn on. At this time, the second current-carrying line passes through the coil Lx, the first switch tube Q1 and the first diode D1 to the first current-carrying line, 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 seventh resistor R7 and the eighth resistor R8 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.

[0156] 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, two current paths are formed at the same time:

[0157] The first current path is the second current-carrying line, the coil Lx, the second resistor R2, 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;

[0158] The first current path is the second current-carrying line, the coil Lx, the second resistor R2, 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;

[0159] At this time, it is equivalent to that the connection between the first resistor R1 and the fourth end d in the impedance network is in an open circuit state, and the voltage of the second current-carrying line is applied to the negative electrode of the first voltage-stabilizing diode ZD1 through the coil Lx, exceeding the breakdown voltage of the first voltage-stabilizing diode ZD1, thereby forming a current path ①: the second current-carrying line, the coil Lx, the first resistor R1, the first voltage-stabilizing diode ZD1, the sixth resistor R6, the fifth resistor R5, the first diode D1, and the first current-carrying line; the voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 increases, triggering the first switch tube Q1 to turn on, and 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.

[0160] 4.Reference Figure 8 As shown, when the second shielding conductor structure 120 between the sixth end f and the fifth end e is open-circuited, two current paths are formed at the same time:

[0161] The first current path is the second current-carrying line, the coil Lx, the first resistor R1, the fourth terminal d, the sixth terminal f, the third terminal c, the first terminal a, the third resistor R3, the first diode D1, and the first current-carrying line;

[0162] The second current path is the second current-carrying line, the coil Lx, the first resistor R1, the fourth terminal d, the sixth terminal f, the third terminal c, the second terminal b, the fourth resistor R4, the first diode D1, and the first current-carrying line;

[0163] At this time, it is equivalent to that the connection between the second resistor R2 and the fifth end e in the impedance network is in an open circuit state. The voltage of the second current-carrying line is applied to the negative electrode of the second voltage-stabilizing diode ZD2 through the coil Lx, exceeding the breakdown voltage of the second voltage-stabilizing diode ZD2, thereby forming a current path ②: the second current-carrying line, the coil Lx, the second resistor R2, the second voltage-stabilizing diode ZD2, the eighth resistor R8, the seventh resistor R7, the first diode D1, and the first current-carrying line; the voltage at the connection point of the seventh resistor R7 and the eighth resistor R8 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.

[0164] 5.Reference Fig. 9 As shown, when the connection between the third terminal c and the sixth terminal f is open-circuited, it is equivalent to that the connection between the first resistor R1 and the fourth terminal d and the connection between the second resistor R2 and the fifth terminal e in the impedance network are both in an open-circuit state, and the voltage of the second current-carrying line is applied to the cathode of the first voltage-stabilizing diode ZD1 through the coil Lx, exceeding the breakdown voltage of the first voltage-stabilizing diode ZD1, and the voltage of the second current-carrying line is applied to the cathode of the second voltage-stabilizing diode ZD2 through the coil Lx, exceeding the breakdown voltage of the second voltage-stabilizing diode ZD2, and two current paths ① and ② are formed at the same time:

[0165] Current path ①: second current-carrying line, coil Lx, first resistor R1, first voltage-stabilizing diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0166] Current path ②: second current-carrying line, coil Lx, second resistor R2, second voltage-stabilizing diode ZD2, eighth resistor R8, seventh resistor R7, first diode D1, first current-carrying line;

[0167] The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 increases, triggering the first switch tube Q1 to turn on. At this time, the second current-carrying line passes through the coil Lx, the first switch tube Q1 and the first diode D1 to the first current-carrying line, 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 seventh resistor R7 and the eighth resistor R8 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.

[0168] Reference Fig.10 As shown, when the test switch TEST is closed, two current paths are formed at the same time:

[0169] The first current path is the second current-carrying line, the coil Lx, the test switch TEST, 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;

[0170] The second current path is the second current-carrying line, the coil Lx, the test switch TEST, 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;

[0171] The test switch TEST short-circuits the first resistor R1, and at the same time, the second resistor R2 is short-circuited in the impedance network. The voltage of the second current-carrying line is applied to the cathode of the first voltage-stabilizing diode ZD1 through the coil Lx, exceeding the breakdown voltage of the first voltage-stabilizing diode ZD1. The voltage of the second current-carrying line is applied to the cathode of the second voltage-stabilizing diode ZD2 through the coil Lx, exceeding the breakdown voltage of the second voltage-stabilizing diode ZD2, thereby forming two current paths ① and ② at the same time:

[0172] Current path ①: second current-carrying line, coil Lx, first resistor R1, first voltage-stabilizing diode ZD1, sixth resistor R6, fifth resistor R5, first diode D1, first current-carrying line;

[0173] Current path ②: second current-carrying line, coil Lx, second resistor R2, second voltage-stabilizing diode ZD2, eighth resistor R8, seventh resistor R7, first diode D1, first current-carrying line;

[0174] The voltage at the connection point of the fifth resistor R5 and the sixth resistor R6 increases, triggering the first switch tube Q1 to turn on. At this time, the second current-carrying line passes through the coil Lx, the first switch tube Q1 and the first diode D1 to the first current-carrying line, 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 seventh resistor R7 and the eighth resistor R8 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.

[0175] 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.

[0176] 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.

[0177] 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 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 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; A first driving module is configured to control the switch module to disconnect the power connection between the input end and the output end of the power line when the first open circuit signal is detected or the leakage signal of the first shielding layer conductor structure or the second shielding conductor structure is detected; The second driving module is configured to control the switch module to disconnect the power connection between the input end and the output end of the power line when the second open circuit signal is detected or the leakage signal of the first shielding layer 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: 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 first shielding conductor structure between the second end and the third end; a connection between the third end and the sixth end; The second detection module is further configured to generate the second open circuit signal when an open circuit occurs at at least one of the following positions: a 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 first shielding conductor structure between the first end and the third 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 first detection module includes a first impedance element, the fourth end is connected to the second current-carrying line through the first impedance element, one end of the first driving module is connected to the connection point between the first impedance element and the fourth end, and the other end of the first driving module is connected to the first current-carrying line; the second detection module includes a second impedance element, the fifth end is connected to the second current-carrying line through the second impedance element, one end of the second driving module is connected to the connection point between the second impedance element and the fifth end, and the other end of the second driving module is connected to the first current-carrying line.

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

5. The detection and protection device according to claim 4, characterized in that: The first driving module includes a fifth impedance element, a sixth impedance element and a first Zener diode connected in sequence, the fifth impedance element is connected to the connection point between the third impedance element and the fourth impedance element, and the cathode of the first Zener diode is connected to the connection point between the first impedance element and the fourth end; the second driving module includes a seventh impedance element, an eighth impedance element and a second Zener diode connected in sequence, the seventh impedance element is connected to the connection point between the third impedance element and the fourth impedance element, and the cathode of the second Zener diode is connected to the connection point between the second impedance element and the fifth end.

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

7. The detection and protection device according to claim 6, characterized in that: The switch unit includes a first switch tube and a second switch tube, the connection point of the fifth impedance element and the sixth impedance element is connected to the control pin of the first switch tube, and the connection point of the seventh impedance element and the eighth impedance element is connected to the 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 8, 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, and the test module is configured to short-circuit the first detection module and / or the second detection module after being triggered.

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

12. The detection and protection device according to claim 6, 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 6, characterized in that: It also includes an LED indicating unit connected in parallel with the switch unit, and the LED indicating unit includes a ninth 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.

Images