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

Abstract

The present application discloses a detection and protection apparatus for a power cord, an electrical connection device, and an electric device. The detection and protection apparatus comprises a switch module (210), a current leakage detection module (220), an open-circuit detection module (230), and a trigger module (240). The current leakage detection module (220) comprises a first shielding conductor structure (221) and a second shielding conductor structure (222); the first shielding conductor structure (221) comprises a first end (a) close to an input end of the power cord, a second end (b) close to an output end of the power cord, and a third end (c) located between the first end (a) and the second end (b); the second shielding conductor structure (222) comprises a fourth end (d) close to the input end, a fifth end (e) close to the output end, and a sixth end (f) located between the fourth end (d) and the fifth end (e); and the third end (c) is connected to the sixth end (f).

Description

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

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202311621640.X filed on November 29, 2023, entitled “Detection and protection device, electrical connection device and electrical equipment for power lines”, and application number 202323248888.4 filed on November 29, 2023, entitled “Detection and protection device, electrical connection device and electrical equipment for power lines”, the entire contents of which are incorporated by reference into this application. Technical Field

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

[0004] A leakage circuit detector interrupter (LCDI) is a power connection device for electrical appliances. It detects leakage current in the power cord through a leakage current detection line and, when a certain leakage current is detected, disconnects the appliance from the power supply, ensuring safe use. In recent years, leakage current detection circuit breakers have not only required leakage current detection through the leakage current detection line, but have also introduced higher safety detection requirements, such as the need to detect whether the leakage current detection line is open.

[0005] Currently, when performing leakage detection and open-circuit detection on the leakage current detection line in a detection and protection device for a power line, the leakage current detection line of the power line is generally connected by connecting multiple leakage current detection lines in series, connecting a return line and the leakage current detection line in series, or connecting multiple leakage current detection lines in parallel. This method of constructing a detection path is relatively limited, and the detection flexibility and safety are insufficient.

[0006] Summary of the Invention

[0007] The purpose of the present application is to at least partially solve one of the technical problems existing in the prior art and to provide a power line detection and protection device, an electrical connection device, and an electrical device.

[0008] In a first aspect, an embodiment of the present application provides a detection and protection device for a power line, wherein the power line includes a first current-carrying line and a second current-carrying line, and the detection and protection device includes:

[0009] a switch module, configured to control the power connection between the input end and the output end of the power line;

[0010] A leakage detection module, comprising 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 is used to collect a leakage signal of the first current-carrying line, and the second shielded conductor structure is used to collect a leakage signal of the second current-carrying line; the first shielded conductor structure includes a first end near the input end of the power line, a second end near the output end of the power line, and a third end located between the first and second ends; the second shielded conductor structure includes a fourth end near the input end, a fifth end near the output end, and a sixth end located between the fourth and fifth ends; the third end and the sixth end are connected;

[0011] an open circuit detection module, connected to the first end, the second end, the fourth end, and the fifth end, respectively, the open circuit detection module being configured to generate an open circuit signal when at least a portion of the first shielded conductor structure and / or the second shielded conductor structure is open circuit; and

[0012] A trigger module is coupled to the leakage detection module, the open circuit detection module and the switch module, and is configured to receive the leakage signal and / or the open circuit signal, and drive the switch module to disconnect the power connection in response to the leakage signal and / or the open circuit signal.

[0013] According to the detection and protection device provided in some embodiments of the present application, the trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when turned on, and the control pin of the third switch unit is connected to the open circuit detection module to obtain the open circuit signal; the negative pole of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure to obtain the leakage signal in the first shielding conductor structure and / or the second shielding conductor structure, and the positive pole is connected to the control pin of the third switch unit.

[0014] According to the detection and protection device provided in some embodiments of the present application, the negative electrode of the voltage stabilizing unit is connected to any one of the following:

[0015] the first end;

[0016] the second end;

[0017] the third end;

[0018] the fourth end;

[0019] the fifth end;

[0020] The sixth end.

[0021] According to the detection and protection device provided in some embodiments of the present application, the open circuit detection module includes a first switch unit and a second switch unit;

[0022] One end of the first switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module further includes a first bias unit for providing a switch-on signal to the first switch unit, one end of the first bias unit is connected to the first end, and the other end is connected to the fourth end;

[0023] One end of the second switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module also includes a second bias unit for providing a conduction switching signal to the second switch unit, one end of the second bias unit is connected to the second end, and the other end is connected to the fifth end.

[0024] According to the detection and protection device provided in some embodiments of the present application, the first bias unit is configured to: when any part of the first shielded conductor structure and the second shielded conductor structure between the first end and the fourth end is open-circuited, provide a switch-on signal to the first switch unit to turn on the first switch unit, so that the first switch unit sends an open-circuit signal to the trigger module; the second bias unit is configured to: when any part of the first shielded conductor structure and the second shielded conductor structure between the second end and the fifth end is open-circuited, provide a switch-on signal to the second switch unit to turn on the second switch unit, so that the second switch unit sends an open-circuit signal to the trigger module.

[0025] According to the detection and protection device provided in some embodiments of the present application, the first switching unit includes a first transistor, the first bias unit includes a first resistor, and the open circuit detection module also includes a second resistor and a third resistor, one end of the first resistor is connected to the first end, the emitter of the first transistor and one end of the second resistor, the other end of the second resistor is connected to one of the first current-carrying line and the second current-carrying line, the other end of the first resistor is connected to the fourth end, the base of the first transistor and one end of the third resistor, the other end of the third resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the first transistor is connected to the trigger module.

[0026] According to the detection and protection device provided in some embodiments of the present application, the second switching unit includes a second transistor, the second bias unit includes a fourth resistor, and the open circuit detection module also includes a fifth resistor and a sixth resistor, one end of the fourth resistor is connected to the second end, the emitter of the second transistor and one end of the fifth resistor, the other end of the fifth resistor is connected to one of the first current-carrying line and the second current-carrying line, the other end of the fourth resistor is connected to the fifth end, the base of the second transistor and one end of the sixth resistor, the other end of the sixth resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the second transistor is connected to the trigger module.

[0027] According to the detection and protection device provided in some embodiments of the present application, the open circuit detection module includes a first switch unit and a second switch unit;

[0028] One end of the first switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module further includes a first bias unit for providing a switch-on signal to the first switch unit, one end of the first bias unit is connected to the first end, and the other end is connected to the fifth end;

[0029] One end of the second switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module also includes a second bias unit for providing a conduction switching signal to the second switch unit, one end of the second bias unit is connected to the second end, and the other end is connected to the fourth end.

[0030] According to the detection and protection device provided in some embodiments of the present application, the trigger module also includes a tripping coil for generating electromagnetic force to drive the switch module to disconnect the power connection, and the tripping coil and the third switch unit are connected in series between the first current-carrying line and the second current-carrying line.

[0031] According to the detection and protection device provided in some embodiments of the present application, the third switching unit includes a thyristor, and the trigger module also includes a seventh resistor. The control electrode of the thyristor is respectively connected to one end of the seventh resistor, the positive electrode of the voltage stabilizing unit and the open circuit detection module, the other end of the seventh resistor and the cathode of the thyristor are connected to the first current-carrying line, and the anode of the thyristor is connected to the second current-carrying line through the tripping coil.

[0032] According to the detection and protection device provided in some embodiments of the present application, the trigger module further includes a first capacitor connected in parallel with the seventh resistor.

[0033] According to the detection and protection device provided in some embodiments of the present application, the trigger module also includes a first diode and a second diode, the other end of the seventh resistor and the cathode of the thyristor are connected to the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected to the first current-carrying line, and the cathode of the second diode is connected to the connection point between the thyristor and the tripping coil.

[0034] The detection and protection device provided according to some embodiments of the present application further includes a leakage simulation module, which includes a first test switch, one end of which is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the first shielding conductor structure and / or the second shielding conductor structure.

[0035] According to the detection and protection device provided in some embodiments of the present application, the leakage simulation module also includes an eighth resistor and a ninth resistor, the other end of the first test switch is respectively connected to one end of the eighth resistor and one end of the ninth resistor, and the other end of the eighth resistor and the other end of the ninth resistor are respectively connected to two of the first end, the second end, the third end, the fourth end, the fifth end and the sixth end.

[0036] According to some embodiments of the present application, the detection and protection device further includes a second test switch, one end of which is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the control pin of the third switch unit.

[0037] According to the detection and protection device provided in some embodiments of the present application, the trigger module also includes a tenth resistor and an eleventh resistor, the negative pole of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure through the eleventh resistor, and the open circuit detection module is connected to the negative pole of the voltage stabilizing unit through the tenth resistor, so that the third switching unit obtains the open circuit signal through the voltage stabilizing unit.

[0038] In a second aspect, an embodiment of the present application provides an electrical connection device, comprising the detection and protection device, a shell and the power cord as described in the embodiment of the first aspect above, wherein the power cord is connected to the shell, and the switch module, the open circuit detection module and the trigger module are arranged in the shell.

[0039] In a third aspect, an embodiment of the present application provides an electrical device, comprising a load device and the electrical connection device as described in the embodiment of the second aspect above, wherein the output end of the power line is connected to the load device.

[0040] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purposes and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0042] The present application is further described below with reference to the accompanying drawings and embodiments;

[0043] FIG1 is a block diagram of the module principle of the detection and protection device provided in an embodiment of the present application;

[0044] FIG2 is a circuit diagram of a detection and protection device provided in an embodiment of the present application;

[0045] FIG3 is a circuit diagram of a detection and protection device provided in another embodiment of the present application;

[0046] FIG4 is a circuit diagram of a detection and protection device provided in another embodiment of the present application;

[0047] FIG5 is a circuit diagram of a detection and protection device provided in yet another embodiment of the present application;

[0048] 6 is a schematic diagram of a conductive path on the first shielding conductor structure and the second shielding conductor structure of the detection and protection device provided by an embodiment of the present application when a portion of the first shielding conductor structure between the first end and the third end is open;

[0049] 7 is a schematic diagram of the conductive path on the first shielding conductor structure and the second shielding conductor structure of the detection and protection device provided by an embodiment of the present application when the portion of the first shielding conductor structure between the second end and the third end is open;

[0050] 8 is a schematic diagram of a conductive path on the first shielding conductor structure and the second shielding conductor structure when the connecting conductor between the third end and the sixth end of the detection and protection device provided by an embodiment of the present application is open;

[0051] 9 is a schematic diagram of the conductive path on the first shielding conductor structure and the second shielding conductor structure of the detection and protection device provided by an embodiment of the present application when the portion of the second shielding conductor structure between the fourth end and the sixth end is open;

[0052] 10 is a schematic diagram of the conductive path on the first shielding conductor structure and the second shielding conductor structure of the detection and protection device provided by an embodiment of the present application when the portion of the second shielding conductor structure between the fifth end and the sixth end is open;

[0053] FIG11 is a circuit diagram of a detection and protection device provided in another embodiment of the present application; and

[0054] FIG12 is a schematic structural diagram of an electrical connection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] This section will describe the specific embodiments of the present application in detail. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0056] In the description of the embodiments of this application, "several" means one or more, "more" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, and "above," "below," and "within" are understood to include the number itself. "At least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If "first," "second," or the like is used in the description, it is only for the purpose of distinguishing technical features and cannot be understood to indicate or imply relative importance, or to implicitly indicate the number of the indicated technical features, or to implicitly indicate the order of the indicated technical features.

[0057] It should be noted that the terms "set," "install," and "connect" in the embodiments of this application should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in the embodiments of this application based on the specific content of the technical solution. For example, the term "connect" can refer to mechanical connection, electrical connection, or communication; it can refer to direct connection or indirect connection through an intermediary.

[0058] It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0059] A leakage current detection circuit breaker (LCDI) is a power connection device for electrical appliances that 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, ensuring safe use. In recent years, in addition to the need to detect the leakage current of the power cord through the leakage current detection line, leakage current detection circuit breakers have also put forward higher safety detection requirements, such as the need to detect whether the leakage current detection line has an open circuit. At present, in the detection and protection device of the power cord, when performing leakage detection and open circuit detection of the leakage current detection line, the leakage current detection line of the power cord is generally connected in series by multiple leakage current detection lines, in series by a return line and the leakage current detection line, or in parallel by multiple leakage current detection lines. The method of constructing the detection path is relatively limited, and the flexibility and safety of the detection are insufficient.

[0060] Based on this, the embodiments of the present application provide a power line detection and protection device, an electrical connection device and an electrical device, which can enrich the feasibility and flexibility of leakage detection and shielding structure open circuit detection of the power line, and is conducive to improving the power supply safety of the power line.

[0061] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0062] Figure 1 is a block diagram of the module principle of the detection and protection device provided in an embodiment of the present application; Figure 2 is a circuit principle diagram of the detection and protection device provided in an embodiment of the present application. Referring to Figures 1 and 2, a first embodiment of the present application provides a detection and protection device for a power line, wherein the power line includes a first current-carrying line 110 and a second current-carrying line 120.

[0063] It is understood that when the power line supplies power to an electrical device using two-phase AC power, one of the following two situations can be true: the first current-carrying line 110 is the live wire L, and the second current-carrying line 120 is the neutral wire N; the first current-carrying line 110 is the neutral wire N, and the second current-carrying line 120 is the live wire L. When the power line supplies power to an electrical device using three-phase AC power, one of the following three situations can be true: the first current-carrying line 110 is the live wire L1, and the second current-carrying line 120 is the neutral wire N; the first current-carrying line 110 is the neutral wire N, and the second current-carrying line 120 is the live wire L1; the first current-carrying line 110 is the live wire L1, and the second current-carrying line 120 is the live wire L2. The following uses the case where the first current-carrying line 110 is the live wire L and the second current-carrying line 120 is the neutral wire N as an example for explanation; the remaining situations are similarly applicable.

[0064] The detection and protection device includes a switch module 210, a leakage detection module 220, an open circuit detection module 230 and a trigger module 240, wherein:

[0065] The switch module 210 is used to control the power connection between the input end and the output end of the power line; as shown in Figure 2, the switch module 210 is provided with a switch terminal on the first current-carrying line 110 and the second current-carrying line 120. When the switch terminal of the switch module 210 is closed, the power connection between the input end and the output end of the power line is connected; when the switch terminal of the switch module 210 is opened, the power connection between the input end and the output end of the power line is disconnected.

[0066] The leakage detection module 220 includes a first shielded conductor structure 221 covering the first current-carrying line 110 and a second shielded conductor structure 222 covering the second current-carrying line 120; the first shielded conductor structure 221 is used to collect the leakage signal of the first current-carrying line 110, and the second shielded conductor structure 222 is used to collect the leakage signal of the second current-carrying line 120; the first shielded conductor structure 221 includes a first end a close to the input end of the power line, a second end b close to the output end of the power line, and a third end c located between the first end a and the second end b; the second shielded conductor structure 222 includes a fourth end d close to the input end, a fifth end e close to the output end, and a sixth end f located between the fourth end d and the fifth end e; the third end c and the sixth end f are connected. It can be understood that the first shielding conductor structure 221 in the leakage detection module 220 covers the first current-carrying line 110 so that the leakage signal of the first current-carrying line 110 can be collected, and the second shielding conductor structure 222 in the leakage detection module 220 covers the second current-carrying line 120 so that the leakage signal of the second current-carrying line 120 can be collected. On this basis, by connecting the third end c in the middle of the first shielding conductor structure 221 with the sixth end f in the second shielding conductor structure 222, there is a connection point between the shielding conductor structures of the first current-carrying line 110 and the second current-carrying line 120, and the two shielding conductor structures are no longer independent and separate.

[0067] The open circuit detection module 230 is respectively connected to the first end a, the second end b, the fourth end d and the fifth end e. The open circuit detection module 230 is configured to generate an open circuit signal when at least a portion of the first shielding conductor structure 221 and / or the second shielding conductor structure 222 is open circuited. It can be understood that the open circuit detection module 230 is respectively connected to the first end a and the second end b of the first shielding conductor structure 221, the fourth end d and the fifth end e of the second shielding conductor structure 222, so that the open circuit detection module 230 can simultaneously perform open circuit detection on multiple different detection paths, for example, from the first end a of the first shielding conductor structure 221 to the third end c, and then to the sixth end of the second shielding conductor structure 222. f, and finally to the fourth end d of the second shielding conductor structure 222; the detection path from the first end a of the first shielding conductor structure 221 to the third end c, then to the sixth end f of the second shielding conductor structure 222, and finally to the fifth end e of the second shielding conductor structure 222; the detection path from the second end b of the first shielding conductor structure 221 to the third end c, then to the sixth end f of the second shielding conductor structure 222, and finally to the fourth end d of the second shielding conductor structure 222; the detection path from the second end b of the first shielding conductor structure 221 to the third end c, then to the sixth end f of the second shielding conductor structure 222, and finally to the fifth end e of the second shielding conductor structure 222.

[0068] The trigger module 240 is coupled to the leakage detection module 220 , the open circuit detection module 230 and the switch module 210 , and is configured to receive a leakage signal and / or an open circuit signal and drive the switch module 210 to disconnect the power connection in response to the leakage signal and / or the open circuit signal.

[0069] According to the detection and protection device for the power line provided in the embodiment of the present application, the trigger module 240 is coupled with the leakage detection module 220, the open circuit detection module 230 and the switch module 210 respectively, and can drive the switch module 210 to disconnect the power connection when leakage occurs in the first current-carrying line 110 or the second current-carrying line 120, or when at least a part of the first shielding conductor structure 221 and / or the second shielding conductor structure 222 is open, thereby ensuring the power supply safety of the power line; in the detection and protection device for the power line of this embodiment, the first shielding conductor structure 221 and the second shielding conductor structure 222 formed by the multiple detection segments can be combined, so as to construct a shielding network with multiple different detection paths, which greatly enriches the feasibility and flexibility of leakage detection and open circuit detection of the shielding structure of the power line, and is conducive to improving the power supply safety of the power line.

[0070] 2 , in the detection and protection device provided in some embodiments of the present application, the trigger module 240 includes a voltage stabilizing unit ZD1 and a third switch module 241 that drives the switch module 210 to disconnect the power connection between the input end and the output end of the power line when turned on. The control pin of the third switch unit 241 is connected to the open circuit detection module 230 to obtain an open circuit signal; the negative pole of the voltage stabilizing unit ZD1 is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 to obtain a leakage signal in the first shielding conductor structure 221 and / or the second shielding conductor structure 222, and the positive pole of the voltage stabilizing unit ZD1 is connected to the control pin of the third switch unit 241.

[0071] It can be understood that since the first shielding conductor structure 221 and the second shielding conductor structure 222 have been connected together through the third end c of the first shielding conductor structure 221 and the sixth end f of the second shielding conductor structure 222, when there is no short circuit between the first shielding conductor structure 221, the second shielding conductor structure 222 and the connecting conductor between the third end c and the sixth end f, the negative pole of the voltage stabilizing unit ZD1 only needs to be connected to any point in the first shielding conductor structure 221 and the second shielding conductor structure 222, and the leakage signal detected at any other position of the first shielding conductor structure 221 and the second shielding conductor structure 222 can be transmitted to the negative pole of the voltage stabilizing unit ZD1.

[0072] In the detection and protection device provided in some embodiments of the present application, the negative electrode of the voltage stabilizing unit ZD1 is connected to any one of the following: the first terminal a; the second terminal b; the third terminal c; the fourth terminal d; the fifth terminal e; and the sixth terminal f.

[0073] It can be understood that the first end a, the second end b and the third end c are the connection points that have been led out on the first shielding conductor structure 221, and the fourth end d, the fifth end e and the sixth end f are the connection points that have been led out on the second shielding conductor structure 222. Therefore, the negative pole of the voltage stabilizing unit ZD1 is connected to any one of the above six ends, which has the advantage of convenient wiring.

[0074] It should be noted that the control pin of the third switch unit 241 can be directly connected to the open circuit detection module 230 to obtain an open circuit signal, or it can be indirectly connected to the open circuit detection module 230. For example, as shown in Figure 2, the trigger module 240 also includes a tenth resistor R10, and the control pin of the third switch unit 241 is indirectly connected to the open circuit detection module 230 through the tenth resistor R10; similarly, the negative pole of the voltage stabilizing unit ZD1 can be directly connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222, or it can be indirectly connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222. For example, as shown in Figure 2, the trigger module 240 also includes an eleventh resistor R11, and the negative pole of the voltage stabilizing unit ZD1 is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 through the eleventh resistor R11.

[0075] 2 , in the detection and protection device provided in some embodiments of the present application, the negative electrode of the voltage stabilizing unit ZD1 is connected to any one of the first terminal a, the second terminal b, the third terminal c, the fourth terminal d, the fifth terminal e, and the sixth terminal f through the eleventh resistor R11.

[0076] 2 , in the detection and protection device provided in some embodiments of the present application, the open circuit detection module 230 includes a first switch unit 231 and a second switch unit 232 ;

[0077] One end of the first switch unit 231 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open circuit detection module 230 also includes a first bias unit for providing a switch-on signal to the first switch unit 231. One end of the first bias unit is connected to the first end a, and the other end is connected to the fourth end d.

[0078] One end of the second switch unit 232 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open circuit detection module 230 also includes a second bias unit for providing a conduction switching signal to the second switch unit 232. One end of the second bias unit is connected to the second end b, and the other end is connected to the fifth end e.

[0079] In this embodiment, since the two ends of the first bias unit are respectively connected to the first end a and the fourth end d, and the first end a and the fourth end d are short-circuited by the portion of the first shielding conductor structure 221 located between the first end a and the third end c, the connecting conductor between the third end c and the sixth end f, and the portion of the second shielding conductor structure 222 located between the sixth end f and the fourth end d, the two ends of the first bias unit are short-circuited, and the switch-on signal cannot be provided to the first switch unit 231; similarly, since the two ends of the second bias unit are respectively connected to the second end b and the fifth end e, and the second end b and the fifth end e are short-circuited by the portion of the first shielding conductor structure 221 located between the second end b and the third end c, the connecting conductor between the third end c and the sixth end f, and the portion of the second shielding conductor structure 222 located between the sixth end f and the fifth end e, the two ends of the second bias unit are short-circuited, and the switch-on signal cannot be provided to the second switch unit 232.

[0080] 2 , in the detection and protection device provided in some embodiments of the present application, the first bias unit is configured to: when any part of the first shielded conductor structure 221 and the second shielded conductor structure 222 between the first end a and the fourth end d is open-circuited, provide a switch-on signal to the first switch unit 231 to turn on the first switch unit 231, so that the first switch unit 231 sends an open-circuit signal to the trigger module 240; the second bias unit is configured to: when any part of the first shielded conductor structure 221 and the second shielded conductor structure 222 between the second end b and the fifth end e is open-circuited, provide a switch-on signal to the second switch unit 232 to turn on the second switch unit 232, so that the second switch unit 232 sends an open-circuit signal to the trigger module 240.

[0081] It should be noted that, in this embodiment, when any part of the first shielding conductor structure 221 and the second shielding conductor structure 222 between the first end a and the fourth end d is open-circuited, that is, when the part of the first shielding conductor structure 221 between the first end a and the third end c is open-circuited, or when the part of the second shielding conductor structure 222 between the sixth end f and the fourth end d is open-circuited, the two ends of the first bias unit will no longer be short-circuited, so that a switch-on signal can be provided to the first switch unit 231, so that the first switch unit 231 is turned on and then, under the action of the electric energy provided by the first current-carrying line 110 or the second current-carrying line 120, the trigger module 240 is triggered. Similarly, when any part of the first shielded conductor structure 221 and the second shielded conductor structure 222 between the second end b and the fifth end e is open-circuited, that is, when the part of the first shielded conductor structure 221 between the second end b and the third end c is open-circuited, or when the part of the second shielded conductor structure 222 between the sixth end f and the fifth end e is open-circuited, the two ends of the second bias unit will no longer be short-circuited, so that a switch-on signal can be provided to the second switch unit 232, so that the second switch unit 232 is turned on and then sends an open-circuit signal to the trigger module 240 under the action of the electric energy provided by the first current-carrying line 110 or the second current-carrying line 120. It should also be noted that when the connecting conductor between the third end c and the sixth end f is disconnected, the first end a and the fourth end d, and the second end b and the fifth end e will no longer be short-circuited, that is, the two ends of the first bias unit and the two ends of the second bias unit will no longer be short-circuited, so that the switch conduction signal can be provided to the first switch unit 231 and the second switch unit 232 at the same time, thereby causing the first switch unit 231 and the second switch unit 232 to send an open circuit signal to the trigger module 240 at the same time.

[0082] 2 , in the detection and protection device provided in some embodiments of the present application, the first switch unit 231 includes a first transistor Q1, the first bias unit includes a first resistor R1, and the open circuit detection module 230 further includes a second resistor R2 and a third resistor R3. One end of the first resistor R1 is connected to the first end a, the emitter of the first transistor Q1, and one end of the second resistor R2. The other end of the second resistor R2 is connected to the second current-carrying line 120. The other end of the first resistor R1 is connected to the fourth end d, the base of the first transistor Q1, and one end of the third resistor R3. The other end of the third resistor R3 is connected to the first current-carrying line 110. The collector of the first transistor Q1 is connected to the trigger module 240. It is understood that the collector of the first transistor Q1 can be directly connected to the control pin of the third switch unit 241 in the trigger module 240, or can be indirectly connected to the control pin of the third switch unit 241 in the trigger module 240. For example, as shown in FIG. 2 , the collector of the first transistor Q1 is connected to the control pin of the third switch unit 241 in the trigger module 240 via the tenth resistor R10.

[0083] In this embodiment, the two ends of the first resistor R1 are respectively connected to the first end a and the fourth end d, thereby being short-circuited. The first resistor R1 does not bear voltage division, so that the emitter and the base of the first transistor Q1 are equipotential points. The first resistor R1 does not provide a bias voltage to the emitter junction of the first transistor Q1, and the first transistor Q1 cannot be turned on; when the portion of the first shielding conductor structure 221 located between the first end a and the third end c is open, or when the portion of the second shielding conductor structure 222 located between the sixth end f and the fourth end d is open, or when the connecting conductor between the third end c and the sixth end f is disconnected, the two ends of the first resistor R1 will no longer be short-circuited and can bear voltage division, thereby providing a bias voltage to the emitter junction of the first transistor Q1 to turn on the first transistor Q1.

[0084] It should be noted that the trigger module 240 shown in FIG2 includes a trip coil Lx and a first diode D1. The end of the second resistor R2 connected to the second current-carrying line 120 is not directly connected to the second current-carrying line 120, but is connected to the second current-carrying line 120 via the trip coil Lx. It is understood that in other embodiments, the end of the second resistor R2 connected to the second current-carrying line 120 can also be directly connected to the second current-carrying line 120, without being connected to the second current-carrying line 120 via the trip coil Lx. Similarly, the end of the third resistor R3 connected to the first current-carrying line 110 is not directly connected to the first current-carrying line 110, but is connected to the first current-carrying line 110 via the first diode D1. It is understood that in other embodiments, the end of the third resistor R3 connected to the first current-carrying line 110 can also be directly connected to the first current-carrying line 110, without being connected to the first current-carrying line 110 via the first diode D1.

[0085] 2 , in the detection and protection device provided in some embodiments of the present application, the second switch unit 232 includes a second transistor Q2, the second bias unit includes a fourth resistor R4, and the open circuit detection module 230 further includes a fifth resistor R5 and a sixth resistor R6. One end of the fourth resistor R4 is connected to the second end b, the emitter of the second transistor Q2, and one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to the second current-carrying line 120. The other end of the fourth resistor R4 is connected to the fifth end e, the base of the second transistor Q2, and one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to the first current-carrying line 110. The collector of the second transistor Q2 is connected to the trigger module 240. It will be understood that the collector of the second transistor Q2 can be directly connected to the control pin of the third switch unit 241 in the trigger module 240, or can be indirectly connected to the control pin of the third switch unit 241 in the trigger module 240. For example, as shown in FIG. 2 , the collector of the second transistor Q2 is connected to the control pin of the third switch unit 241 in the trigger module 240 via the tenth resistor R10.

[0086] In this embodiment, the two ends of the fourth resistor R4 are respectively connected to the second end b and the fifth end e, thereby being short-circuited. The fourth resistor R4 does not bear voltage division, so that the emitter and the base of the second transistor Q2 are equipotential points. The fourth resistor R4 does not provide a bias voltage to the emitter junction of the second transistor Q2, and the second transistor Q2 cannot be turned on; when the portion of the first shielding conductor structure 221 located between the second end b and the third end c is open, or when the portion of the second shielding conductor structure 222 located between the sixth end f and the fifth end e is open, or when the connecting conductor between the third end c and the sixth end f is disconnected, the two ends of the fourth resistor R4 will no longer be short-circuited and can bear voltage division, thereby providing a bias voltage to the emitter junction of the second transistor Q2 to turn on the second transistor Q2.

[0087] It should be noted that the trigger module 240 shown in FIG2 includes a trip coil Lx and a first diode D1. The end of the fifth resistor R5 connected to the second current-carrying line 120 is not directly connected to the second current-carrying line 120, but is connected to the second current-carrying line 120 via the trip coil Lx. It is understood that in other embodiments, the end of the fifth resistor R5 connected to the second current-carrying line 120 can also be directly connected to the second current-carrying line 120, without being connected to the second current-carrying line 120 via the trip coil Lx. Similarly, the end of the sixth resistor R6 connected to the first current-carrying line 110 is not directly connected to the first current-carrying line 110, but is connected to the first current-carrying line 110 via the first diode D1. It is understood that in other embodiments, the end of the sixth resistor R6 connected to the first current-carrying line 110 can also be directly connected to the first current-carrying line 110, without being connected to the first current-carrying line 110 via the first diode D1.

[0088] In addition, it can be understood that in the embodiment of FIG. 2 , one end of the second resistor R2 and one end of the fifth resistor R5 are connected together and then connected to the second current-carrying line 120 via the trip coil Lx, and one end of the third resistor R3 and one end of the sixth resistor R6 are connected to the first current-carrying line 110 via the first diode D1. In some other embodiments, one end of the second resistor R2 and one end of the fifth resistor R5 are connected together and then connected to the first current-carrying line 110 via the trip coil Lx, and one end of the third resistor R3 and one end of the sixth resistor R6 are connected to the second current-carrying line 120 via the first diode D1.

[0089] In another embodiment of the present application that is different from the embodiment shown in FIG2 , the open circuit detection module 230 includes a first switch unit 231 and a second switch unit 232 ; the trigger module 240 includes a trip coil Lx and a first diode D1 ;

[0090] One end of the first switch unit 231 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open circuit detection module 230 further includes a first bias unit for providing a switch-on signal to the first switch unit 231. One end of the first bias unit is connected to the first end a, and the other end is connected to the fifth end e. Specifically, referring to FIG3 , the first switch unit 231 includes a first transistor Q1, the first bias unit includes a first resistor R1, and the first switch unit 231 further includes a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected to the second current-carrying line 120 via a trip coil Lx, the other end of the second resistor R2 is connected to one end of the first resistor R1, the emitter of the first transistor Q1, and the first end a, the other end of the first resistor R1 is connected to one end of the third resistor R3, the base of the first transistor Q1, and the fifth end e, the collector of the first transistor Q1 is connected to the trigger module 240, and the other end of the third resistor R3 is connected to the first current-carrying line 110 via a first diode D1.

[0091] One end of the second switch unit 232 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open circuit detection module 230 also includes a second bias unit for providing a conduction switching signal to the second switch unit 232. One end of the second bias unit is connected to the second end b, and the other end is connected to the fourth end d. Specifically, the second switch unit 232 includes a second transistor Q2, the second bias unit includes a fourth resistor R4, and the second switch unit 232 also includes a fifth resistor R5 and a sixth resistor R6. One end of the fifth resistor R5 is connected to the second current-carrying line 120 via the trip coil Lx, and the other end of the fifth resistor R5 is connected to one end of the fourth resistor R4, the emitter of the second transistor Q2, and the second end b. The other end of the fourth resistor R4 is connected to one end of the sixth resistor R6, the base of the second transistor Q2, and the fourth end d. The collector of the second transistor Q2 is connected to the trigger module 240, and the other end of the sixth resistor R6 is connected to the first current-carrying line 110 via the first diode D1.

[0092] It can be understood that the embodiment shown in Figure 3 has the same principle as the embodiment shown in Figure 2, the difference is that in Figure 3, the two ends of the first resistor R1 are short-circuited by the part of the first shielding conductor structure 221 located between the first end a and the third end c, the connecting conductor between the third end c and the sixth end f, and the part of the second shielding conductor structure 222 located between the sixth end f and the fifth end d; the two ends of the fourth resistor R4 are short-circuited by the part of the first shielding conductor structure 221 located between the second end b and the third end c, the connecting conductor between the third end c and the sixth end f, and the part of the second shielding conductor structure 222 located between the sixth end f and the fourth end d.

[0093] In the detection and protection devices provided in some embodiments of the present application, the trigger module 240 includes a trip coil Lx that is further configured to generate an electromagnetic force to drive the switch module 210 to disconnect the power connection. The trip coil Lx is connected in series with the third switch unit 241 between the first current-carrying line 110 and the second current-carrying line 120. Specifically, referring to FIG. 2 , the third switch unit 241 includes a thyristor Q3. The trigger module 240 also includes a seventh resistor R7. The control electrode of the thyristor Q3 is connected to one end of the seventh resistor R7, the positive electrode of the voltage stabilizing unit ZD1, and the open circuit detection module 230, respectively. The other end of the seventh resistor R7 is connected to the cathode of the thyristor Q3 and is connected to the first current-carrying line 110 via the first diode D1. The anode of the thyristor Q3 is connected to the second current-carrying line 120 via the trip coil Lx. The trigger module 240 may further include a tenth resistor R10. One end of the seventh resistor R7 is connected to the control electrode of the thyristor Q3 and then connected to the collector of the first transistor Q1 and the collector of the second transistor Q2 of the open circuit detection module 230 via the tenth resistor R10.

[0094] It should be noted that when the end of the seventh resistor R7 connected to the control electrode of the thyristor Q3 receives an open circuit signal or a leakage signal, a voltage will be generated across the two ends of the seventh resistor R7 and provided to the base and cathode of the thyristor Q3, that is, a switch-on signal is provided to the thyristor Q3, causing the thyristor Q3 to turn on, thereby energizing the trip coil Lx to generate electromagnetic force to drive the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0095] 2 , in the detection and protection device provided in some embodiments of the present application, the trigger module 240 further includes a first capacitor C1 connected in parallel with the seventh resistor R7 .

[0096] It is understandable that when the first current-carrying line 110 is the live line L and the second current-carrying line 120 is the neutral line N, even if the end of the seventh resistor R7 connected to the control electrode of the thyristor Q3 receives an open-circuit signal or a leakage signal, the thyristor Q3 needs to be turned on during the negative half-cycle of the AC power supply. Therefore, a first capacitor C1 is provided in parallel with the seventh resistor R7. When an open-circuit signal or a leakage signal is received during the positive half-cycle of the AC power supply, the first capacitor C1 can be charged, thereby increasing the potential of the control electrode of the thyristor Q3, and the thyristor Q3 can be triggered to turn on during the negative half-cycle of the AC power supply.

[0097] 2 , in the detection and protection device provided in some embodiments of the present application, the trigger module 240 further includes a first diode D1 and a second diode D2, the other end of the seventh resistor R7 and the cathode of the thyristor Q3 are connected to the anode of the first diode D1 and the anode of the second diode D2, the cathode of the first diode D1 is connected to the first current-carrying line 110, and the cathode of the second diode D2 is connected to the connection point between the thyristor Q3 and the trip coil Lx.

[0098] 2 , the detection and protection devices provided in some embodiments of the present application further include a leakage simulation module 250. The leakage simulation module 250 includes a first test switch TEST1. One end of the first test switch TEST1 is connected to the second current-carrying line 120, and the other end is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222. Preferably, the other end of the first test switch TEST1 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f.

[0099] It can be understood that when the first test switch TEST1 is pressed, the first test switch TEST1 connects the second current-carrying line 120 to the first shielding conductor structure 221 or the second shielding conductor structure 222, that is, the leakage signal of the simulated second current-carrying line 120 is transmitted to the first shielding conductor structure 221 or the second shielding conductor structure 222, so as to test whether the leakage detection function of the detection protection device is intact.

[0100] It is also understood that, in the embodiment of FIG2 , one end of the first test switch TEST1 is not directly connected to the second current-carrying line 120, but is connected to the second current-carrying line 120 via the trip coil Lx. In other embodiments, one end of the first test switch TEST1 may also be changed to be directly connected to the second current-carrying line 120.

[0101] In addition, one end of the first test switch TEST1 may also be directly or indirectly connected to the first current-carrying line 110 instead of being connected to the second current-carrying line 120 .

[0102] 3 and 4 , in the detection and protection device provided in some embodiments of the present application, the leakage simulation module 250 includes, in addition to the first test switch TEST1, an eighth resistor R8 and a ninth resistor R9. One end of the first test switch TEST1 is connected to the second current-carrying line 120, and the other end of the first test switch TEST1 is respectively connected to one end of the eighth resistor R8 and one end of the ninth resistor R9. The other end of the eighth resistor R8 and the other end of the ninth resistor R9 are respectively connected to two of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f.

[0103] It is understandable that when the first test switch TEST1 is pressed, the leakage signal of the second current-carrying line 120 can be simulated and transmitted to two positions in the first shielding conductor structure 221 and the second shielding conductor structure 222, thereby testing whether the leakage detection function of the detection protection device is intact.

[0104] Similarly, in the embodiment shown in FIG. 4 , one end of the first test switch TEST1 may also be directly or indirectly connected to the first current-carrying line 110 instead of being connected to the second current-carrying line 120 .

[0105] 5 , the detection and protection device provided according to some embodiments of the present application further includes a second test switch TEST2 , one end of the second test switch TEST2 being connected to the second current-carrying line 120 , and the other end being connected to the control pin of the third switch unit 241 , that is, connected to the control electrode of the thyristor Q3 .

[0106] When the second test switch TEST2 is pressed, the second current-carrying line 120 directly provides a conduction control signal to the control electrode of the thyristor Q3, and the analog trigger module 240 receives a leakage signal or an open circuit signal, thereby testing whether the trigger module 240 and the switch module 210 can work normally.

[0107] In addition, in the embodiments shown in Figures 2 to 5, the detection and protection device further includes an LED indicator unit 260 connected in parallel with the thyristor Q3. The LED indicator unit 260 includes a twelfth resistor R12, a thirteenth resistor R13, and a light-emitting diode LED1 connected in series. The connection point between the thyristor Q3 and the trip coil Lx is connected to one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is connected to one end of the twelfth resistor R12. The other end of the twelfth resistor R12 is connected to the anode of the light-emitting diode LED1. The cathode of the light-emitting diode LED1 is connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to the first current-carrying line 110.

[0108] Furthermore, the detection and protection device also includes a lightning protection unit 270, which includes a first varistor ZR1 disposed between the first current-carrying line 110 and the second current-carrying line 120. The trigger module 240 also includes a second varistor ZR2 connected in parallel with the thyristor Q3. It is understood that a varistor is a resistor device with a nonlinear volt-ampere characteristic, primarily used to clamp voltage when a circuit experiences overvoltage, absorbing excess current to protect sensitive components.

[0109] Below, the operation of the detection and protection device provided in the embodiment of the present application under various leakage and open circuit conditions is described using the embodiment shown in FIG2 :

[0110] 1. When the leakage signal of the first current-carrying line 110 is transmitted to the first shielding conductor structure 221:

[0111] After the first shielding conductor structure 221 obtains the leakage signal, the voltage stabilizing unit ZD1 is broken down, forming a conductive path of the first current-carrying line 110 - the first shielding conductor structure 221 - the eleventh resistor R11 - the voltage stabilizing unit ZD1 - the seventh resistor R7 - the second diode D2 - the tripping coil Lx - the second current-carrying line 120;

[0112] The voltage of the control electrode of the thyristor Q3 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110.

[0113] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0114] 2. When the leakage signal of the second current-carrying line 120 is transmitted to the second shielding conductor structure 222:

[0115] After the second shielding conductor structure 222 obtains the leakage signal, the voltage stabilizing unit ZD1 is broken down, forming a conductive path of the second current-carrying line 120 - the second shielding conductor structure 222 - the eleventh resistor R11 - the voltage stabilizing unit ZD1 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110 ;

[0116] The voltage of the control electrode of the thyristor Q3 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110.

[0117] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0118] 3. When the portion of the first shielding conductor structure 221 between the first end a and the third end c is open:

[0119] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first resistor R1 are no longer short-circuited; the two ends of the fourth resistor R4 are still short-circuited. As shown by the arrows in FIG6 , the fourth resistor R4 is short-circuited by the conductive path from the second end b to the third end c to the sixth end f to the fifth end e. It should be noted that the conductive path from the second end b to the third end c to the sixth end f to the fourth end d exists simultaneously.

[0120] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - third resistor R3 - first diode D1 - first current-carrying line 110 ;

[0121] The first transistor Q1 is turned on, and the second transistor Q2 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first transistor Q1 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0122] The voltage of the control electrode of the thyristor Q3 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110.

[0123] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0124] 4. When the portion of the first shielding conductor structure 221 between the second end b and the third end c is open:

[0125] The short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the fourth resistor R4 are no longer short-circuited; the two ends of the first resistor R1 are still short-circuited. As shown by the arrows in FIG7 , the first resistor R1 is short-circuited by the conductive path from the first end a to the third end c to the sixth end f to the fourth end d. It should be noted that the conductive path from the first end a to the third end c to the sixth end f to the fifth end e exists simultaneously.

[0126] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - sixth resistor R6 - first diode D1 - first current-carrying line 110 ;

[0127] The second transistor Q2 is turned on, and the first transistor Q1 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - second transistor Q2 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0128] The voltage of the control electrode of the thyristor Q3 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110.

[0129] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0130] 5. When the connecting conductor between the third terminal c and the sixth terminal f is open:

[0131] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first resistor R1 are no longer short-circuited; the short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the fourth resistor R4 are no longer short-circuited, as shown in FIG8 ;

[0132] Forming a conducting path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - third resistor R3 - first diode D1 - first current-carrying line 110, and forming a conducting path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - sixth resistor R6 - first diode D1 - first current-carrying line 110;

[0133] The first transistor Q1 and the second transistor Q2 are both turned on; forming a conducting path of the second current-carrying line 120 - the tripping coil Lx - the second resistor R2 - the first transistor Q1 - the tenth resistor R10 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110, and forming a conducting path of the second current-carrying line 120 - the tripping coil Lx - the fifth resistor R5 - the second transistor Q2 - the tenth resistor R10 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110;

[0134] The voltage of the control electrode of the thyristor Q3 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110.

[0135] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0136] 6. When the portion of the second shielding conductor structure 222 between the fourth end d and the sixth end f is open:

[0137] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first resistor R1 are no longer short-circuited; the two ends of the fourth resistor R4 are still short-circuited. As shown by the arrows in FIG9 , the fourth resistor R4 is short-circuited by the conductive path from the second end b to the third end c to the sixth end f to the fifth end e. It should be noted that the conductive path from the first end a to the third end c to the sixth end f to the fifth end e exists simultaneously.

[0138] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - third resistor R3 - first diode D1 - first current-carrying line 110 ;

[0139] The first transistor Q1 is turned on, and the second transistor Q2 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first transistor Q1 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0140] The voltage of the control electrode of the thyristor Q3 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110.

[0141] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0142] 7. When the portion of the second shielding conductor structure 222 between the fifth end e and the sixth end f is open:

[0143] The short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the fourth resistor R4 are no longer short-circuited; the two ends of the first resistor R1 are still short-circuited. As shown by the arrows in FIG10 , the first resistor R1 is short-circuited by the conductive path from the first end a to the third end c to the sixth end f to the fourth end d. It should be noted that the conductive path from the second end b to the third end c to the sixth end f to the fourth end d also exists.

[0144] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - sixth resistor R6 - first diode D1 - first current-carrying line 110 ;

[0145] The second transistor Q2 is turned on, and the first transistor Q1 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - second transistor Q2 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0146] The voltage of the control electrode of the thyristor Q3 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110.

[0147] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0148] 8. When the first test switch TEST1 is pressed:

[0149] The first test switch TEST1 simulates the leakage signal of the second current-carrying line 120 and transmits it to the first shielding conductor structure 221 or the second shielding conductor structure 222 :

[0150] After the first shielding conductor structure 221 or the second shielding conductor structure 222 obtains the leakage signal, the voltage stabilizing unit ZD1 is broken down, forming a conductive path of the second current-carrying line 120 - tripping coil Lx - first test switch TEST1 - first shielding conductor structure 221 / second shielding conductor structure 222 - voltage stabilizing unit ZD1 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0151] The voltage of the control electrode of the thyristor Q3 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110.

[0152] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0153] Referring to Figure 11 , another embodiment of the present application further provides a detection and protection device. Compared to the embodiment shown in Figure 2 , the difference lies in that the control pin of the third switch unit 241 in the trigger module 240 receives an open-circuit signal via the voltage stabilizing unit ZD1. Specifically, the collector of the first transistor Q1 and the collector of the second transistor Q2 are connected together and connected to one end of the tenth resistor R10. The other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11 and the negative electrode of the voltage stabilizing unit ZD1. The other end of the eleventh resistor R11 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f.

[0154] It is understandable that, with such a configuration, the open circuit signal generated by the open circuit detection module 230 is not directly transmitted to the trigger module 240, but is first transmitted to the voltage stabilizing unit ZD1 and then to the trigger module 240, and the open circuit signal generated by the open circuit detection module 230 can be separated from the leakage detection module 210 through the eleventh resistor R11.

[0155] The detection and protection device for the power line provided in the embodiment of the present application has at least the following beneficial effects: the first shielding conductor structure in the leakage detection module covers the first current-carrying line so that the leakage signal of the first current-carrying line can be collected, and the second shielding conductor structure in the leakage detection module covers the second current-carrying line so that the leakage signal of the second current-carrying line can be collected. On this basis, by connecting the third end in the middle of the first shielding conductor structure with the sixth end in the second shielding conductor structure, there is a connection point between the shielding conductor structures of the first current-carrying line and the second current-carrying line, and the two shielding conductor structures are no longer independent and separated. The open circuit detection module is respectively connected to the first end and the second end of the first shielding conductor structure and the fourth end and the fifth end of the second shielding conductor structure, so that the open circuit detection module can perform open circuit detection on a variety of different detection paths, such as a detection path from the first end of the first shielding conductor structure to the third end, then to the sixth end of the second shielding conductor structure, and finally to the fourth end of the second shielding conductor structure; a detection path from the first end of the first shielding conductor structure to the third end, then to the sixth end of the second shielding conductor structure, and finally a detection path from the second end to the third end of the first shielded conductor structure, to the sixth end of the second shielded conductor structure, and finally to the fourth end of the second shielded conductor structure; a detection path from the second end to the third end of the first shielded conductor structure, to the sixth end of the second shielded conductor structure, and finally to the fifth end of the second shielded conductor structure; in addition, the trigger module is coupled with the leakage detection module, the open circuit detection module and the switch module respectively, and can drive the switch module to disconnect the power connection when leakage occurs in the first current-carrying line or the second current-carrying line, or when at least a part of the first shielded conductor structure and / or the second shielded conductor structure is open, so as to ensure the power supply safety of the power line; in the detection and protection device for the power line of this embodiment, the first shielded conductor structure and the second shielded conductor structure have multiple detection segments that can be combined, so as to construct a shielding network with multiple different detection paths, which greatly enriches the feasibility and flexibility of leakage detection and shielding structure open circuit detection of the power line, and is conducive to improving the power supply safety of the power line.

[0156] 12 , an embodiment of the second aspect of the present application provides an electrical connection device 300 , comprising a detection and protection device as described above in the embodiment of the first aspect, a shell 310 , and a power cord, wherein the power cord is connected to the shell 310 , and the switch module 210 , the open circuit detection module 230 , and the trigger module 240 are arranged in the shell 310 .

[0157] In addition, a third embodiment of the present application provides an electrical device, including a load device and the electrical connection device 300 of the second embodiment above, where the output end of the power line is connected to the load device.

[0158] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A detection and protection device for a power line, wherein: The power line includes a first current-carrying line and a second current-carrying line, and the detection protection device includes: A switch module, used to control the power connection between the input end and the output end of the power line; A leakage detection module, comprising 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 is used to collect leakage signals of the first current-carrying line, and the second shielded conductor structure is used to collect leakage signals of 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 between the first end and the second end; the second shielded conductor structure comprises a fourth end close to the input end, a fifth end close to the output end, and a sixth end between the fourth end and the fifth end; the third end is connected to the sixth end; an open circuit detection module, connected to the first end, the second end, the fourth end and the fifth end respectively, the open circuit detection module being configured to generate an open circuit signal when at least a portion of the first shielding conductor structure and / or the second shielding conductor structure is open circuit; and A trigger module is coupled to the leakage detection module, the open circuit detection module and the switch module, and is configured to receive the leakage signal and / or the open circuit signal, and drive the switch module to disconnect the power connection in response to the leakage signal and / or the open circuit signal.

2. The detection and protection device according to claim 1, wherein: The trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when turned on, and the control pin of the third switch unit is connected to the open circuit detection module to obtain the open circuit signal; the negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure to obtain the leakage signal in the first shielding conductor structure and / or the second shielding conductor structure, and the positive electrode is connected to the control pin of the third switch unit.

3. The detection and protection device according to claim 2, wherein: The negative electrode of the voltage stabilizing unit is connected to any one of the following: the first end; the second end; the third end; the fourth end; the fifth end; The sixth end.

4. The detection and protection device according to any one of claims 1 to 3, wherein: The open circuit detection module includes a first switch unit and a second switch unit; One end of the first switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module, the open circuit detection module further includes a first bias unit for providing a switch-on signal to the first switch unit, one end of the first bias unit is connected to the first end, and the other end is connected to the fourth end; and One end of the second switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module also includes a second bias unit for providing a conduction switching signal to the second switch unit, one end of the second bias unit is connected to the second end, and the other end is connected to the fifth end.

5. The detection and protection device according to claim 4, wherein: The first bias unit is configured to: when any part of the first shielded conductor structure and the second shielded conductor structure between the first end and the fourth end is open-circuited, provide a switch-on signal to the first switch unit to turn on the first switch unit, so that the first switch unit sends an open-circuit signal to the trigger module; the second bias unit is configured to: when any part of the first shielded conductor structure and the second shielded conductor structure between the second end and the fifth end is open-circuited, provide a switch-on signal to the second switch unit to turn on the second switch unit, so that the second switch unit sends an open-circuit signal to the trigger module.

6. The detection and protection device according to claim 5, wherein: The first switch unit includes a first transistor, the first bias unit includes a first resistor, and the open circuit detection module also includes a second resistor and a third resistor, one end of the first resistor is connected to the first end, the emitter of the first transistor and one end of the second resistor, the other end of the second resistor is connected to one of the first current-carrying line and the second current-carrying line, the other end of the first resistor is connected to the fourth end, the base of the first transistor and one end of the third resistor, the other end of the third resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the first transistor is connected to the trigger module.

7. The detection and protection device according to claim 5 or 6, wherein: The second switch unit includes a second transistor, the second bias unit includes a fourth resistor, and the open circuit detection module also includes a fifth resistor and a sixth resistor, one end of the fourth resistor is connected to the second end, the emitter of the second transistor and one end of the fifth resistor, the other end of the fifth resistor is connected to one of the first current-carrying line and the second current-carrying line, the other end of the fourth resistor is connected to the fifth end, the base of the second transistor and one end of the sixth resistor, the other end of the sixth resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the second transistor is connected to the trigger module.

8. The detection and protection device according to any one of claims 1 to 7, wherein: The open circuit detection module includes a first switch unit and a second switch unit; One end of the first switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module, the open circuit detection module further includes a first bias unit for providing a switch-on signal to the first switch unit, one end of the first bias unit is connected to the first end, and the other end is connected to the fifth end; as well as One end of the second switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module also includes a second bias unit for providing a conduction switching signal for the second switch unit, one end of the second bias unit is connected to the second end, and the other end is connected to the fourth end.

9. The detection and protection device according to any one of claims 2 to 8, wherein: The trigger module further includes a trip coil for generating an electromagnetic force to drive the switch module to disconnect the power connection, and the trip coil and the third switch unit are connected in series between the first current-carrying line and the second current-carrying line.

10. The detection and protection device according to claim 9, wherein: The third switch unit includes a thyristor, and the trigger module also includes a seventh resistor. The control electrode of the thyristor is respectively connected to one end of the seventh resistor, the positive electrode of the voltage stabilizing unit and the open circuit detection module, the other end of the seventh resistor and the cathode of the thyristor are connected to the first current-carrying line, and the anode of the thyristor is connected to the second current-carrying line through the tripping coil.

11. The detection and protection device according to claim 10, wherein: The trigger module also includes a first capacitor connected in parallel with the seventh resistor.

12. The detection and protection device according to claim 10 or 11, wherein: The trigger module also includes a first diode and a second diode, the other end of the seventh resistor and the cathode of the thyristor are connected to the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected to the first current-carrying line, and the cathode of the second diode is connected to the connection point between the thyristor and the tripping coil.

13. The detection and protection device according to any one of claims 1 to 12, further comprising a leakage simulation module, wherein the leakage simulation module comprises a first test switch, wherein one end of the first test switch is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the first shielding conductor structure and / or the second shielding conductor structure.

14. The detection and protection device according to claim 13, wherein: The leakage simulation module also includes an eighth resistor and a ninth resistor, the other end of the first test switch is respectively connected to one end of the eighth resistor and one end of the ninth resistor, and the other end of the eighth resistor and the other end of the ninth resistor are respectively connected to two of the first end, the second end, the third end, the fourth end, the fifth end and the sixth end. 15 . The detection and protection device according to claim 2 , further comprising a second test switch, wherein one end of the second test switch is connected to the first current-carrying line or the second current-carrying line, and the other end of the second test switch is connected to a control pin of a third switch unit.

16. The detection and protection device according to any one of claims 2 to 15, wherein: The trigger module also includes a tenth resistor and an eleventh resistor, the negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure through the eleventh resistor, and the open circuit detection module is connected to the negative electrode of the voltage stabilizing unit through the tenth resistor, so that the third switch unit obtains the open circuit signal through the voltage stabilizing unit.

17. An electrical connection device, comprising the detection and protection device according to any one of claims 1 to 16, a housing and the power line, wherein: The power line is connected to the housing, and the switch module, the open circuit detection module and the trigger module are arranged in the housing.

18. An electrical device comprising a load device and the electrical connection device according to claim 17, wherein the output end of the power line is connected to the load device.

Images