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

Abstract

The invention discloses a power line, a detection protection device, electric connection equipment and electric equipment, the input end of the power line is used for connecting the detection protection device, the output end of the power line is used for connecting the electric equipment, and the power line comprises a first current-carrying wire and a second current-carrying wire; a first shielding module used for detecting leakage current wraps the first current-carrying wire, the first shielding module comprises a first conductor and a second conductor which are spaced from each other, and one end, close to the output end, of the first conductor is connected with one end, close to the output end, of the second conductor; a second shielding module used for detecting leakage current wraps the second current-carrying wire, the second shielding module comprises a third conductor and a fourth conductor which are spaced from each other, and one end, close to the output end, of the third conductor is connected with one end, close to the output end, of the fourth conductor; the detection protection device comprises a switch module, an open circuit detection module and a driving module, and can effectively detect the electric leakage condition of the current-carrying wire of the power line and the disconnection condition of the shielding conductor of the power line.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and particularly to a power cord, a detection and protection device, an electrical connection device, and an electrical device. Background Art

[0002] A Leakage Circuit Detector Interrupter (LCDI) is a power connection device for electrical appliances, which can detect the leakage current of a power cord group through a leakage current detection line, and cut off the power connection of the electrical appliance when a certain leakage current is detected to ensure the use safety.

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

[0004] An object of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a power cord, a detection and protection device, an electrical connection device, and an electrical device, which can effectively detect the leakage situation of the current-carrying wire of the power cord and the disconnection situation of the shielding conductor of the power cord.

[0005] In a first aspect, an embodiment of the present invention provides a power cord. The input end of the power cord is used to connect to a detection and protection device, and the output end is used to connect to an electrical device. The power cord includes a first current-carrying wire and a second current-carrying wire;

[0006] The outside of the first current-carrying wire is coated with a first shielding module for detecting leakage current. The first shielding module includes a first conductor and a second conductor that are spaced apart from each other. One end of the first conductor close to the output end is connected to one end of the second conductor close to the output end, so that the first conductor and the second conductor form a first detection branch;

[0007] The outside of the second current-carrying wire is coated with a second shielding module for detecting leakage current. The second shielding module includes a third conductor and a fourth conductor that are spaced apart from each other. One end of the third conductor close to the output end is connected to one end of the fourth conductor close to the output end, so that the third conductor and the fourth conductor form a second detection branch;

[0008] Wherein:

[0009] Both the first detection branch and the second detection branch are connected to the detection and protection device to output a control signal when the first detection branch is open-circuited or when the second detection branch is open-circuited.

[0010] The power cord provided by the embodiments of the present invention has at least the following beneficial effects: by providing a first shielding module outside the first current-carrying line and a second shielding module outside the second current-carrying line, the leakage of the first current-carrying line and the second current-carrying line can be effectively detected; both the first shielding module and the second shielding module are composed of two conductors spaced apart from each other, and one ends of the two conductors close to the output end are connected to form a detection branch, so that both ends of the detection branch are on one side of the input end, which is convenient for connecting the first detection branch and the second detection branch to the detection protection device; when an open circuit occurs in the first detection branch or an open circuit occurs in the second detection branch, a control signal is output to the detection protection device, and the disconnection of the shielding conductor can be effectively detected.

[0011] For the power cord provided by some embodiments of the present invention, one end of the first conductor close to the input end is connected to the detection protection device, one end of the second conductor close to the input end is connected to one end of the third conductor close to the input end, and one end of the fourth conductor close to the input end is connected to the detection protection device.

[0012] For the power cord provided by some embodiments of the present invention, one end of the first conductor close to the input end is connected to one end of the third conductor close to the input end and then connected to the detection protection device, and one end of the second conductor close to the input end is connected to one end of the fourth conductor close to the input end and then connected to the detection protection device.

[0013] For the power cord provided by some embodiments of the present invention, the first conductor is coated with an insulating layer to form a first wire, the second conductor is coated with an insulating layer to form a second wire, and the first wire and the second wire are wound around the outside of the first current-carrying line in parallel; the third conductor is coated with an insulating layer to form a third wire, the fourth conductor is coated with an insulating layer to form a fourth wire, and the third wire and the fourth wire are wound around the outside of the second current-carrying line in parallel.

[0014] For the power cord provided by some embodiments of the present invention, the first conductor and the second conductor are wound around the outside of the first current-carrying line in parallel; the third conductor and the fourth conductor are wound around the outside of the second current-carrying line in parallel.

[0015] For the power cord provided by some embodiments of the present invention, the first conductor and the second conductor are arranged parallel to each other along the extending direction of the first current-carrying line and respectively wrap half of the first current-carrying line; the third conductor and the fourth conductor are arranged parallel to each other along the extending direction of the second current-carrying line and respectively wrap half of the second current-carrying line.

[0016] According to the power cord provided by some embodiments of the present invention, an insulating layer is provided between the first conductor and the second conductor, and an insulating layer is provided between the third conductor and the fourth conductor.

[0017] In a second aspect, an inspection and protection device applied to the power cord described in the first aspect embodiment above is provided by an embodiment of the present invention. The first detection branch and the second detection branch are connected in series or in parallel to form a module to be detected. The inspection and protection device includes a switch module, an open-circuit detection module, and a driving module, wherein:

[0018] The switch module is used to control the electrical connection between the input end and the output end of the power cord;

[0019] The open-circuit detection module includes a first resistor and a first switching tube. The first resistor is connected in parallel with the module to be detected, and the first resistor is further connected to the control pin of the first switching tube to control the first switching tube to act when an open circuit occurs in the module to be detected;

[0020] The driving module is connected to the switch module, the module to be detected, and the first switching tube, and is used to control the switch module to disconnect the electrical connection when a leakage current is detected in the module to be detected or the first switching tube acts.

[0021] The inspection and protection device for the power cord provided by the embodiment of the present invention has at least the following beneficial effects: Shielding modules are coated outside the two current-carrying lines of the power cord. When a leakage occurs in the current-carrying line and is detected by the shielding module, the driving module can control the switch module to disconnect the electrical connection between the input end and the output end of the power cord, realizing the detection and processing of the leakage situation; In addition, an open-circuit detection module is also provided. The first detection branch and the second detection branch are connected in series or in parallel to form a module to be detected. The module to be detected is connected in parallel with the first resistor, so that when there is no open circuit in the module to be detected, the first resistor is short-circuited, and the current does not flow through the first resistor. When an open circuit occurs in the module to be detected, the current can only flow through the first resistor, so that the state of the control pin of the first switching tube connected to the first resistor changes, causing the first switching tube to act, and then the driving module controls the switch module to disconnect the electrical connection between the input end and the output end of the power cord, realizing the detection and processing of the open-circuit situation of the module to be detected. In addition, the inspection and protection device for the power cord provided by the embodiment of the present invention has a simple circuit structure, low cost, and high safety.

[0022] The detection and protection device provided according to some embodiments of the present invention, the driving module includes a switch tripping driving unit, the switch tripping driving unit includes a second switching tube and a coil for generating an electromagnetic force to drive the switching module, the second current-carrying line, the coil, the second switching tube, and the first current-carrying line are connected in sequence to form a tripping control loop when the second switching tube is turned on.

[0023] The detection and protection device provided according to some embodiments of the present invention, the driving module further includes a switching tube driving unit, the switching tube driving unit includes a second resistor and a third resistor connected in series, and the switch tripping driving unit further includes a first diode and a second diode; the module to be detected is connected to the second resistor, the connection point of the second resistor and the third resistor is connected to the control pin of the second switching tube, and the third resistor is connected to the first current-carrying line through the first diode and connected to the connection point of the second switching tube and the coil through the second diode.

[0024] The detection and protection device provided according to some embodiments of the present invention, the open-circuit detection module further includes a fourth resistor, one end of the fourth resistor is connected to the connection point of the first resistor and the second detection branch, and the other end is connected to the connection point of the second switching tube and the coil.

[0025] The detection and protection device provided according to some embodiments of the present invention, the open-circuit detection module further includes a fifth resistor, one end of the fifth resistor is connected to the connection point of the first resistor and the first detection branch, and the other end is connected to the connection point of the third resistor and the first diode.

[0026] The detection and protection device provided according to some embodiments of the present invention, the open-circuit detection module further includes a sixth resistor, and the connection point of the first resistor and the second detection branch is connected to the control pin of the first switching tube through the sixth resistor.

[0027] The detection and protection device provided according to some embodiments of the present invention further includes a test switch, one end of the test switch is connected to the connection point of the first resistor and the module to be detected, and the other end is connected to the connection point of the second switching tube and the coil.

[0028] The detection and protection device provided according to some embodiments of the present invention further includes an LED indication unit connected in parallel with the second switching tube, and the LED indication unit includes a seventh resistor and a light-emitting diode connected in series.

[0029] In a third aspect, an embodiment of the present invention provides an electrical connection device, including a housing, a power cord as described in the first aspect embodiment above, and a detection and protection device as described in the second aspect embodiment above. The detection and protection device is disposed in the housing, and the power cord is connected to the housing.

[0030] In a fourth aspect, an embodiment of the present invention provides an electrical equipment, including a load device and the electrical connection device as described in the third aspect embodiment above. The power cord is connected to the load device.

[0031] Other features and advantages of the present invention will be described in the following specification, and partly become apparent from the specification, or be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures specifically pointed out in the specification, claims, and drawings. Description of the Drawings

[0032] The drawings are used to provide further understanding of the technical solutions of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solutions of the present invention, and do not constitute a limitation to the technical solutions of the present invention.

[0033] The present invention will be further described below in conjunction with the drawings and embodiments;

[0034] Figure 1 is a schematic structural diagram of the overall connection of the power cord and the detection and protection device provided by an embodiment of the present invention;

[0035] Figure 2 is a schematic structural diagram of the overall connection of the power cord and the detection and protection device provided by another embodiment of the present invention;

[0036] Figure 3 is a schematic cross-sectional view of the power cord provided by an embodiment of the present invention;

[0037] Figure 4 is a schematic diagram of the first shielding module and the second shielding module provided by an embodiment of the present invention;

[0038] Figure 5 is a schematic diagram of the shielding module provided by another embodiment of the present invention;

[0039] Figure 6 is a schematic structural diagram of the power cord and the detection and protection device provided by an embodiment of the present invention;

[0040] Figure 7 is a schematic structural diagram of the power cord and the detection and protection device provided by another embodiment of the present invention;

[0041] Figure 8 is a schematic structural diagram of the electrical connection device provided by an embodiment of the present invention. Detailed implementation manners

[0042] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The role of the accompanying drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.

[0043] In the description of the embodiments of the present invention, the meaning of "a number of" is one or more, the meaning of "a plurality of" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the present number, "above", "below", "within", etc. are understood as including the present number, "at least one" means one or more, and "at least one of the following" and its similar expressions refer to any combination of these items, including any combination of single items or plural items. If there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0044] It should be noted that terms such as "set", "installed", "connected", etc. in the embodiments of the present invention should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connected" can be a mechanical connection, an electrical connection, or a connection that can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium.

[0045] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] A leakage current detection and protection device for a power cord (hereinafter referred to as "LCDI device") is an electrical fire safety protection device. Its main structure is a power cord with a plug. Its main function is to detect leakage current between the live wire, neutral wire, etc. of the power cord from the power supply plug to the load electrical appliance (such as an air conditioner, a dehumidifier) and the wire protection layer (shield), and cut off the power supply of the electrical equipment to prevent the occurrence of a fire, so as to provide safety protection. Therefore, the LCDI device can prevent arc fault fires caused by damage to the power cord and a decrease in insulation strength due to aging, wear, extrusion, or animal gnawing of the live wire (L wire), neutral wire (N wire), and ground wire in the power cord. In existing LCDI devices, when the leakage current detection line of the live wire or neutral wire in the power cord does not have a protection function due to an open circuit or a break, the product can still supply power output, so there are potential hazards of fire or other electrical safety problems. Therefore, there is an urgent need for a leakage current detection and protection device for a power cord that can detect the leakage current detection line.

[0047] Based on this, the embodiments of the present invention provide a power cord, a detection and protection device, an electrical connection device, and an electrical device, which can effectively detect the leakage of the current-carrying line of the power cord and the disconnection of the shielding conductor of the power cord. In addition, the detection and protection device of the power cord provided by the embodiments of the present invention has a simple circuit structure, low cost, and high safety.

[0048] The following further elaborates on the embodiments of the present invention with reference to the accompanying drawings.

[0049] Figure 1 FIG. 7 is a schematic structural diagram of the overall connection of the power cord and the detection and protection device provided by an embodiment of the present invention; Figure 2 FIG. 9 is a schematic structural diagram of the overall connection of the power cord and the detection and protection device provided by another embodiment of the present invention; Figure 3 FIG. 11 is a schematic cross-sectional view of the power cord provided by an embodiment of the present invention.

[0050] Referring to Figures 1 to 3 , an embodiment of the first aspect of the present invention provides a power cord. The input end of the power cord is used to connect to the detection and protection device 100, and the output end is used to connect to an electrical device. The power cord includes a first current-carrying line L and a second current-carrying line N. It can be understood that the power cord may further include a third current-carrying line PE used as a ground wire, and each of the first current-carrying line L, the second current-carrying line N, and the third current-carrying line PE is provided with its own insulating layer on the outside. It should also be noted that if the power cord supplies power to an electrical device using three-phase alternating current, the power cord may further include a fourth current-carrying line and a fifth current-carrying line as the other two live wires. Hereinafter, the case where the power cord includes the first current-carrying line L and the second current-carrying line N will be taken as an example for description.

[0051] The outside of the first current-carrying line L is coated with a first shielding module 200 for detecting leakage current. When the first current-carrying line L leaks electricity and is detected by the first shielding module 200, the first shielding module 200 can output a leakage current detection signal to the detection and protection device 100 so that the detection and protection device 100 processes the leakage situation of the first current-carrying line L. As Figure 4 shown in FIG. 21, the first shielding module 200 includes a first conductor 210 and a second conductor 220 that are spaced apart from each other. One end a2 of the first conductor 210 close to the output end is connected to one end b2 of the second conductor 220 close to the output end, so that the first conductor 210 and the second conductor 220 form a first detection branch. It should also be noted that one end of the first conductor 210 close to the input end is denoted as the a1 end, and one end of the second conductor 220 close to the input end is denoted as the b1 end. Then, the first detection branch is the conductor branch of the a1 end of the first conductor 210 - the a2 end of the first conductor 210 - the b2 end of the second conductor 220 - the b1 end of the second conductor 220.

[0052] The outside of the second current-carrying line N is covered with a second shielding module 300 for detecting leakage current. When the second current-carrying line N leaks electricity and is detected by the second shielding module 300, the second shielding module 300 can output a leakage current detection signal to the detection and protection device 100 so that the detection and protection device 100 can process the leakage situation of the second current-carrying line N. As Figure 4 shown, the second shielding module 300 includes a third conductor 310 and a fourth conductor 320 that are spaced apart from each other. One end of the third conductor 310 near the output end is connected to one end of the fourth conductor 320 near the output end, so that the third conductor 310 and the fourth conductor 320 form a second detection branch; it should also be noted that one end of the third conductor 310 near the input end is denoted as the c1 end, and one end of the fourth conductor 320 near the input end is denoted as the d1 end. Then, the second detection branch is a conductor branch from the c1 end of the fourth conductor 320 - the c2 end of the fourth conductor 320 - the d2 end of the fourth conductor 320 - the d1 end of the fourth conductor 320.

[0053] Both the first detection branch and the second detection branch are connected to the detection and protection device 100 to output a control signal when an open circuit occurs in the first detection branch or when an open circuit occurs in the second detection branch. It can be understood that the first detection branch and the second detection branch can be connected in series first and then connected to the detection and protection device 100, for example Figure 1 shown; the first detection branch and the second detection branch can also be connected in parallel and then connected to the detection and protection device 100, for example Figure 2 shown.

[0054] According to the power cord provided by the embodiment of the present invention, by providing the first shielding module 200 outside the first current-carrying line L and the second shielding module 300 outside the second current-carrying line N, the leakage situations of the first current-carrying line L and the second current-carrying line N can be effectively detected; both the first shielding module 200 and the second shielding module 300 are composed of two conductors spaced apart from each other, and one end of the two conductors near the output end is connected to form a detection branch, so that both ends of the detection branch are on one side of the input end, which is convenient for the first detection branch and the second detection branch to be connected to the detection and protection device 100; when an open circuit occurs in the first detection branch or when an open circuit occurs in the second detection branch, a control signal is output to the detection and protection device 100, and the disconnection situation of the shielding conductor can be effectively detected.

[0055] It should also be noted that, referring to Figure 3, an insulating layer 230 is provided outside the first current-carrying line L, and the first shielding module 200 composed of the first conductor 210 and the second conductor 220 is wrapped outside the insulating layer 230. In addition, an insulating layer 240 is provided to wrap the first shielding module 200, that is, the insulating layer 240 wraps the first current-carrying line L, the insulating layer 230, and the first shielding module 200 at the same time; similarly, an insulating layer 330 is provided outside the second current-carrying line N, and the second shielding module 300 composed of the third conductor 310 and the fourth conductor 320 is wrapped outside the insulating layer 330. In addition, an insulating layer 340 is provided to wrap the second shielding module 300, that is, the insulating layer 340 wraps the second current-carrying line N, the insulating layer 330, and the second shielding module 300 at the same time. In addition, the power line is also provided with an insulating layer 821, and the insulating layer 821 wraps the first current-carrying line L, the second current-carrying line N, and the third current-carrying line PE at the same time. It can be understood that the remaining space inside the power line except for the first current-carrying line L, the second current-carrying line N, and the third current-carrying line PE can be filled with insulating materials.

[0056] Figure 3 The cross-sectional shape of the power line shown is circular. It should be noted that the circular shape is one of the cross-sectional shapes of the power line, and the cross-sectional shape of the power line can also be square, elliptical, polygonal, or other irregular shapes.

[0057] In addition, the materials of the first conductor 210, the second conductor 220, the third conductor 310, and the fourth conductor 320 can be metals, such as but not limited to gold, silver, copper, iron, aluminum, alloys, etc.; the materials of the first conductor 210, the second conductor 220, the third conductor 310, and the fourth conductor 320 can also be semiconductor materials, such as but not limited to carbon, silicon, germanium, graphene, etc.

[0058] Refer to Figure 1 , in the power line provided in some embodiments of the present invention, one end a1 of the first conductor 210 close to the input end is connected to the detection and protection device 100, one end b1 of the second conductor 220 close to the input end is connected to one end c1 of the third conductor 310 close to the input end, and one end d1 of the fourth conductor 320 close to the input end is connected to the detection and protection device 100.

[0059] It can be understood that in Figure 1In the illustrated embodiment, the first detection branch and the second detection branch are connected in series to form a module to be detected. The module to be detected is a conductor branch from the a1 end of the first conductor 210 - the a2 end of the first conductor 210 - the b2 end of the second conductor 220 - the b1 end of the second conductor 220 - the c1 end of the fourth conductor 320 - the c2 end of the fourth conductor 320 - the d2 end of the fourth conductor 320 - the d1 end of the fourth conductor 320. Both ends of the module to be detected are respectively connected to the detection and protection device 100, that is, the a1 end of the first conductor 210 and the d1 end of the fourth conductor 320 are respectively connected to the detection and protection device 100.

[0060] Referring to Figure 2 , in the power cord provided in some embodiments of the present invention, one end a1 of the first conductor 210 close to the input end is connected to one end c1 of the third conductor 310 close to the input end and is connected to the detection and protection device 100, and one end b1 of the second conductor 220 close to the input end is connected to one end d1 of the fourth conductor 320 close to the input end and is connected to the detection and protection device 100.

[0061] It can be understood that in Figure 2 the illustrated embodiment, the first detection branch and the second detection branch are connected in parallel to form a module to be detected, and both ends of the module to be detected are respectively connected to the detection and protection device 100.

[0062] Referring to Figure 4 , in the power cord provided in some embodiments of the present invention, the first conductor 210 is coated with an insulating layer on the outside to form a first wire, the second conductor 220 is coated with an insulating layer on the outside to form a second wire, and the first wire and the second wire are wound side by side around the outside of the first current-carrying line L; the third conductor 310 is coated with an insulating layer on the outside to form a third wire, the fourth conductor 320 is coated with an insulating layer on the outside to form a fourth wire, and the third wire and the fourth wire are wound side by side around the outside of the second current-carrying line N.

[0063] In this embodiment, the first conductor 210, the second conductor 220, the third conductor 310, and the fourth conductor 320 are all coated with insulating layers on the outside, which can make the first conductor 210 and the second conductor 220 arranged side by side insulated from each other at positions other than the connection points, and make the third conductor 310 and the fourth conductor 320 arranged side by side insulated from each other at positions other than the connection points. The first conductor 210 and the second conductor 220 are parallel to each other and are wrapped around the outside of the first current-carrying line L in a spiral winding manner, and the third conductor 310 and the fourth conductor 320 are parallel to each other and are wrapped around the outside of the second current-carrying line N in a spiral winding manner.

[0064] It should also be noted that the first conductor 210, the second conductor 220, the third conductor 310, and the fourth conductor 320 can be conductors woven from multiple thin strips or single conductors of various shapes.

[0065] Referring to Figure 4 , in the power cord provided in some embodiments of the present invention, the first conductor 210, the second conductor 220, the third conductor 310, and the fourth conductor 320 may also simply use conductors without an outer insulating layer wrapped around them, that is, the surfaces of the first conductor 210, the second conductor 220, the third conductor 310, and the fourth conductor 320 are conductive. The first conductor 210 and the second conductor 220 are wound around the outside of the first current-carrying line L side by side; the third conductor 310 and the fourth conductor 320 are wound around the outside of the second current-carrying line N side by side. At this time, an insulating layer needs to be provided between the first conductor 210 and the second conductor 220, and an insulating layer needs to be provided between the third conductor 310 and the fourth conductor 320 to prevent the first conductor 210 and the second conductor 220 from contacting each other at positions other than the connection points, and to prevent the third conductor 310 and the fourth conductor 320 from contacting each other at positions other than the connection points, so as to ensure that the open-circuit conditions at various positions of the first detection branch and the second detection branch can be effectively detected.

[0066] Referring to Figure 5 , in the power cord provided in some embodiments of the present invention, the first conductor 210 and the second conductor 220 are arranged parallel to each other along the extending direction of the first current-carrying line L and respectively wrap half of the first current-carrying line L; the third conductor 310 and the fourth conductor 320 are arranged parallel to each other along the extending direction of the second current-carrying line N and respectively wrap half of the second current-carrying line N.

[0067] In this embodiment, the first conductor 210 and the second conductor 220 do not wrap the first current-carrying line L in a spiral winding manner, but adopt a special shape to cooperate with wrapping the first current-carrying line L. For example, referring to Figure 5 as shown, the first conductor 210 and the second conductor 220 respectively present the shape of half of a cylinder; similarly, the third conductor 310 and the fourth conductor 320 do not wrap the second current-carrying line N in a spiral winding manner, but adopt a special shape to cooperate with wrapping the second current-carrying line N. For example, referring to Figure 5 as shown, the third conductor 310 and the fourth conductor 320 respectively present the shape of half of a cylinder. In addition, in order to prevent the first conductor 210 and the second conductor 220 from contacting each other at positions other than the connection points when the power cord is bent, twisted, folded, etc., and to prevent the third conductor 310 and the fourth conductor 320 from contacting each other at positions other than the connection points, an insulating layer can be provided between the first conductor 210 and the second conductor 220, and an insulating layer can be provided between the third conductor 310 and the fourth conductor 320.

[0068] Referring to Figure 6 and Figure 7, an embodiment of the second aspect of the present invention provides a detection and protection device 100 for a power cord applied to the power cord in the above embodiment of the first aspect. The first detection branch and the second detection branch are connected in series or in parallel to form a module to be detected. The detection and protection device 100 includes a switch module 110, an open-circuit detection module 120, and a drive module 130, where:

[0069] The switch module 110 is used to control the electrical connection between the input end and the output end of the power cord;

[0070] The open-circuit detection module 120 includes a first resistor R1 and a first switching tube Q1. The first resistor R1 is connected in parallel with the module to be detected, and the first resistor R1 is further connected to the control pin of the first switching tube Q1 to control the first switching tube Q1 to act when an open circuit occurs in the module to be detected;

[0071] The drive module 130 is connected to the switch module 110, the module to be detected, and the first switching tube Q1, and is used to control the switch module 110 to disconnect the electrical connection when a leakage current is detected in the module to be detected or the first switching tube Q1 acts.

[0072] According to the detection and protection device 100 for a power cord provided by the embodiment of the present invention, shielding modules are coated on the outsides of the two current-carrying lines of the power cord. When a leakage occurs in the current-carrying line and is detected by the shielding module, the drive module 130 can control the switch module 110 to disconnect the electrical connection between the input end and the output end of the power cord, so as to detect and process the leakage situation; in addition, an open-circuit detection module 120 is also provided. The first detection branch and the second detection branch are connected in series or in parallel to form a module to be detected. The module to be detected is connected in parallel with the first resistor R1, so that when there is no open circuit in the module to be detected, the first resistor R1 is short-circuited, and the current does not flow through the first resistor R1. When an open circuit occurs in the module to be detected, the current can only flow through the first resistor R1, so that the state of the control pin of the first switching tube Q1 connected to the first resistor R1 changes, causing the first switching tube Q1 to act, and then the drive module 130 controls the switch module 110 to disconnect the electrical connection between the input end and the output end of the power cord, so as to detect and process the open-circuit situation of the module to be detected. In addition, for the detection and protection device 100 for a power cord provided by the embodiment of the present invention, the circuit structure is simple, the cost is low, and the safety is high.

[0073] Refer to Figure 6 and Figure 7, in the detection and protection device 100 provided by some embodiments of the present invention, the driving module 130 includes a switch trip driving unit 131. The switch trip driving unit 131 includes a second switch tube Q2 and a coil Lx for generating an electromagnetic force to drive the switch module 110. The second current-carrying line N, the coil Lx, the second switch tube Q2, and the first current-carrying line L are connected in sequence to form a trip control loop when the second switch tube Q2 is turned on. Among them, the first switch tube Q1 and the second switch tube Q2 can be any one of a thyristor, a bipolar transistor, and a field effect transistor.

[0074] It can be understood that when the first detection branch detects a leakage current in the first current-carrying line L in the power line, or when the second detection branch detects a leakage current in the second current-carrying line N in the power line, the detected module will generate a leakage current signal with a relatively high voltage level, which can trigger the second switch tube Q2 to turn on, thereby forming a trip control loop, enabling the coil Lx to be energized to generate an electromagnetic force, driving the switch module 110 to act, and cutting off the power connection between the input end and the output end of the power line; similarly, when the detected module has an open circuit situation, the state of the control pin of the first switch tube Q1 changes, causing the first switch tube Q1 to turn on, and then triggering the second switch tube Q2 to turn on, thereby forming a trip control loop, enabling the coil Lx to be energized to generate an electromagnetic force, driving the switch module 110 to act, and cutting off the power connection between the input end and the output end of the power line.

[0075] Refer to Figure 6 and Figure 7 , in the detection and protection device 100 provided by some embodiments of the present invention, the driving module 130 further includes a switch tube driving unit 132. The switch tube driving unit 132 includes a second resistor R2 and a third resistor R3 connected in series. The switch trip driving unit 131 further includes a first diode D1 and a second diode D2; the detected module is connected to the second resistor R2, the connection point of the second resistor R2 and the third resistor R3 is connected to the control pin of the second switch tube Q2, and the third resistor R3 is connected to the first current-carrying line L through the first diode D1 and to the connection point of the second switch tube Q2 and the coil Lx through the second diode D2. Among them, in Figure 6In the illustrated embodiment, the a1 end of the first conductor 210 near the input end is connected to one end of the first resistor R1 and one end of the second resistor R2, and the d1 end of the fourth conductor 320 near the input end is connected to the other end of the first resistor R1; the other end of the second resistor R2 is connected to one end of the third resistor R3 and the control pin of the second switching transistor Q2, and the other end of the third resistor R3 is simultaneously connected to one switching pin of the second switching transistor Q2, the positive electrode of the first diode D1, and the positive electrode of the second diode D2. The negative electrode of the first diode D1 is connected to the first current-carrying line L, and the negative electrode of the second diode D2 is connected to the other switching pin of the second switching transistor Q2 and connected to one end of the coil Lx. The other end of the coil Lx is connected to the second current-carrying line N. Additionally, in Figure 7 In the illustrated embodiment, the a1 end of the first conductor 210 near the input end is connected to one end of the ninth resistor R9, and the c1 end of the third conductor 310 near the input end is connected to one end of the tenth resistor R10. The other ends of the ninth resistor R9 and the tenth resistor R10 are connected together and connected to one end of the second resistor R2. The b1 end of the second conductor 220 near the input end and the d1 end of the fourth conductor 320 near the input end are connected together and connected to the other end of the first resistor R1. The other end of the second resistor R2 is connected to one end of the third resistor R3 and the control pin of the second switching transistor Q2, and the other end of the third resistor R3 is simultaneously connected to one switching pin of the second switching transistor Q2, the positive electrode of the first diode D1, and the positive electrode of the second diode D2. The negative electrode of the first diode D1 is connected to the first current-carrying line L, and the negative electrode of the second diode D2 is connected to the other switching pin of the second switching transistor Q2 and connected to one end of the coil Lx. The other end of the coil Lx is connected to the second current-carrying line N.

[0076] It can be understood that when a leakage current occurs in the first current-carrying line L to the first conductor 210 or the second conductor 220, a current loop will be formed with the current flow direction being the first current-carrying line L, the first conductor 210 / second conductor 220, the second resistor R2, the third resistor R3, the second diode D2, the coil Lx, and the second current-carrying line N. Thus, under the voltage division action of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching transistor Q2 increases and triggers conduction, forming a trip control loop with the current flow direction being the second current-carrying line N, the coil Lx, the second switching transistor Q2, the first diode D1, and the first current-carrying line L, causing the coil Lx to be energized to generate an electromagnetic force, driving the switch module 110 to act, and cutting off the power connection between the input end and the output end of the power line. Similarly, when a leakage current occurs in the second current-carrying line N to the third conductor 310 or the fourth conductor 320, a current loop will be formed with the current flow direction being the second current-carrying line N, the third conductor 310 / fourth conductor 320 / first conductor 210 / second conductor 220, the second resistor R2, the third resistor R3, the first diode D1, and the first current-carrying line L. Thus, under the voltage division action of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching transistor Q2 increases and triggers conduction, forming a trip control loop with the current flow direction being the second current-carrying line N, the coil Lx, the second switching transistor Q2, the first diode D1, and the first current-carrying line L, causing the coil Lx to be energized to generate an electromagnetic force, driving the switch module 110 to act, and cutting off the power connection between the input end and the output end of the power line.

[0077] Referring to Figure 6 and Figure 7 , in the detection and protection device 100 provided in some embodiments of the present invention, the open-circuit detection module 120 further includes a fourth resistor R4. One end of the fourth resistor R4 is connected to the connection point of the first resistor R1 and the second detection branch, and the other end is connected to the connection point of the second switching transistor Q2 and the coil Lx.

[0078] It can be understood that when the fourth resistor R4 is set and the detected module composed of the first detection branch and the second detection branch is not disconnected, the detected module is connected in parallel with the first resistor R1, thereby short-circuiting the first resistor R1, forming a current loop with the direction of the second current-carrying line N, the coil Lx, the fourth resistor R4, the detected module, the second resistor R2, the third resistor R3, the first diode D1, and the first current-carrying line L. By reasonably configuring the resistance values of the fourth resistor R4, the second resistor R2, and the third resistor R3, when the detected module is not disconnected, the voltage of the control pin of the first switching tube Q1 can be made relatively low and insufficient to turn on the first switching tube Q1; when the detected module is disconnected, a current loop is formed with the direction of the second current-carrying line N, the coil Lx, the fourth resistor R4, the first resistor R1, the second resistor R2, the third resistor R3, the first diode D1, and the first current-carrying line L. Under the voltage-dividing action of the first resistor R1 and the fourth resistor R4, the voltage of the control pin of the first switching tube Q1 rises and triggers conduction; then a current loop with the direction of the second current-carrying line N, the coil Lx, the first switching tube Q1, the second resistor R2, the third resistor R3, the first diode D1, and the first current-carrying line L is formed. Thus, under the voltage-dividing action of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching tube Q2 rises and triggers conduction, forming a tripping control loop with the direction of the second current-carrying line N, the coil Lx, the second switching tube Q2, the first diode D1, and the first current-carrying line L, causing the coil Lx to generate electromagnetic force, driving the switch module 110 to act, and cutting off the power connection between the input end and the output end of the power line.

[0079] Referring to Figure 6 and Figure 7 , in the detection and protection device 100 provided in some embodiments of the present invention, the open-circuit detection module 120 further includes a fifth resistor R5. One end of the fifth resistor R5 is connected to the connection point of the first resistor R1 and the first detection branch, and the other end is connected to the connection point of the third resistor R3 and the first diode D1.

[0080] It can be understood that by setting the fifth resistor R5, the fifth resistor R5 is equivalent to being connected in parallel with the branch composed of the second resistor R2 and the third resistor R3. Thus, when the detected module is disconnected, it can replace the second resistor R2 and the third resistor R3 to form a current loop with the direction of the second current-carrying line N, the coil Lx, the fourth resistor R4, the first resistor R1, the fifth resistor R5, the first diode D1, and the first current-carrying line L.

[0081] Referring to Figure 6 and Figure 7 , in the detection and protection device 100 provided in some embodiments of the present invention, the open-circuit detection module 120 further includes a sixth resistor R6. The connection point of the first resistor R1 and the second detection branch is connected to the control pin of the first switching tube Q1 through the sixth resistor R6.

[0082] It can be understood that setting the sixth resistor R6 as the input resistor of the control pin of the first switching transistor Q1 can prevent the first shielding module 200 and the second shielding module 300 from generating a large voltage impact when detecting the leakage current of the current-carrying line, which may cause damage to the first switching transistor Q1. The sixth resistor R6 can play a good role in protecting the first switching transistor Q1.

[0083] Referring to Figure 6 and Figure 7 , in the detection and protection device 100 provided in some embodiments of the present invention, the switching transistor driving unit 132 further includes a first capacitor C1 connected in parallel with the third resistor R3. In addition, it can also be seen that the detection and protection device further includes a lightning protection unit 150. The lightning protection unit 150 includes a first varistor ZR1 disposed between the first current-carrying line L and the second current-carrying line N; the switch tripping driving unit 131 further includes a second varistor ZR2 connected in parallel with the second switching transistor Q2. It can be understood that a varistor is a resistor device with non-linear volt-ampere characteristics, mainly used for voltage clamping when the circuit is subjected to overvoltage, and absorbing excess current to protect sensitive devices.

[0084] Referring to Figure 6 and Figure 7 , in the detection and protection device 100 provided in some embodiments of the present invention, it further includes a test switch TEST. One end of the test switch TEST is connected to the connection point between the first resistor R1 and the module to be detected, and the other end is connected to the connection point between the second switching transistor Q2 and the coil Lx.

[0085] It can be understood that when the test switch TEST is pressed, a current loop is formed with the current flow direction being the second current-carrying line N, the coil Lx, the test switch TEST, the first wire 310, the first shielding module 200 / second shielding module 300, the second resistor R2, the third resistor R3, the first diode D1, and the first current-carrying line L. Thus, under the voltage division of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching transistor Q2 increases and triggers conduction, forming a tripping control loop with the current flow direction being the second current-carrying line N, the coil Lx, the second switching transistor Q2, the first diode D1, and the first current-carrying line L, causing the coil Lx to be energized to generate electromagnetic force, driving the switch module 110 to act, and cutting off the power connection between the input end and the output end of the power line.

[0086] Referring to Figure 6 and Figure 7, in the detection and protection device 100 provided in some embodiments of the present invention, an LED indication unit 140 is further included in parallel with the second switching tube Q2. The LED indication unit 140 includes a seventh resistor R7 and a light-emitting diode LED1 connected in series. It can also be seen that the LED indication unit 140 further includes an eighth resistor R8. The connection point of the second switching tube Q2 and the coil Lx is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the positive electrode of the light-emitting diode LED1, the negative electrode of the light-emitting diode LED1 is connected to the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected to the first current-carrying line L.

[0087] It can be understood that when the first switching tube Q1 and the second switching tube Q2 are not conducting, that is, when the first shielding module 200 and the second shielding module 300 do not detect leakage current and the detected module composed of the first detection branch and the second detection branch does not have a disconnection, a current loop with a flow direction of the second current-carrying line N, the coil Lx, the eighth resistor R8, the seventh resistor R7, the light-emitting diode LED1, the first diode D1, and the first current-carrying line L is formed, and the light-emitting diode LED1 is powered on and lit; when the second switching tube Q2 acts and conducts, it is equivalent to short-circuiting the LED indication unit 140, and the light-emitting diode LED1 is no longer lit. Moreover, when the second switching tube Q2 conducts, it will control the switching module 110 to act and cut off the power connection between the input end and the output end of the power line, and the light-emitting diode LED1 also loses power and is no longer lit.

[0088] Referring to Figure 8 , an embodiment of the third aspect of the present invention provides an electrical connection device 800, including a housing 810, a power line 820 as in the first aspect embodiment above, and a detection and protection device 100 as in the second aspect embodiment above. The detection and protection device 100 is disposed in the housing 810, and the power line 820 is connected to the housing 810.

[0089] It can be understood that a PCB board is disposed inside the housing 810, and the circuit components included in the detection and protection device 100 are disposed on the PCB board. Figure 6 The a1 end of the first conductor 210 near the input end and the d1 end of the fourth conductor 320 near the input end are both connected to the PCB board. The connection manners of the a1 end of the first conductor 210 and the d1 end of the fourth conductor 320 to the PCB board include but are not limited to welding, pin insertion, locking pieces, etc.; similarly, Figure 7The a1 end of the first conductor 210 close to the input end, the b1 end of the second conductor 220 close to the input end, the c1 end of the third conductor 310 close to the input end, and the d1 end of the fourth conductor 320 close to the input end are all connected to the PCB board. The connection methods of the a1 end of the first conductor 210, the b1 end of the second conductor 220, the c1 end of the third conductor 310, and the d1 end of the fourth conductor 320 to the PCB board include, but are not limited to, welding, pin insertion, locking pieces, etc.

[0090] Fourthly, an embodiment of the present invention provides an electrical device, including a load device and the electrical connection device 800 in the above third aspect embodiment, and a power cord 820 is connected to the load device.

[0091] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A power cord, characterized in that, the input end of the power cord is used to connect to a detection and protection device, and the output end is used to connect to an electrical device. The power cord includes: A first current-carrying line, the outside of the first current-carrying line is coated with a first shielding module for detecting leakage current. The first shielding module includes a first conductor and a second conductor spaced apart from each other. One end of the first conductor close to the output end is connected to one end of the second conductor close to the output end, so that the first conductor and the second conductor form a first detection branch; A second current-carrying line, the outside of the second current-carrying line is coated with a second shielding module for detecting leakage current. The second shielding module includes a third conductor and a fourth conductor spaced apart from each other. One end of the third conductor close to the output end is connected to one end of the fourth conductor close to the output end, so that the third conductor and the fourth conductor form a second detection branch; Wherein: Both the first detection branch and the second detection branch are connected to the detection and protection device to output a control signal when an open circuit occurs in the first detection branch or when an open circuit occurs in the second detection branch.

2. The power cord according to claim 1, characterized in that, One end of the first conductor close to the input end is connected to the detection and protection device, one end of the second conductor close to the input end is connected to one end of the third conductor close to the input end, and one end of the fourth conductor close to the input end is connected to the detection and protection device.

3. The power cord according to claim 1, characterized in that, One end of the first conductor close to the input end is connected to one end of the third conductor close to the input end and is connected to the detection and protection device, and one end of the second conductor close to the input end is connected to one end of the fourth conductor close to the input end and is connected to the detection and protection device.

4. The power cord according to claim 1, characterized in that, The outside of the first conductor is coated with an insulating layer to form a first wire, the outside of the second conductor is coated with an insulating layer to form a second wire, and the first wire and the second wire are wound around the outside of the first current-carrying line side by side; the outside of the third conductor is coated with an insulating layer to form a third wire, the outside of the fourth conductor is coated with an insulating layer to form a fourth wire, and the third wire and the fourth wire are wound around the outside of the second current-carrying line side by side.

5. The power cord according to claim 1, characterized in that, The first conductor and the second conductor are wound around the outside of the first current-carrying line side by side; the third conductor and the fourth conductor are wound around the outside of the second current-carrying line side by side.

6. The power cord according to claim 1, characterized in that, The first conductor and the second conductor are arranged parallel to each other along the extending direction of the first current-carrying line and respectively wrap half of the first current-carrying line; the third conductor and the fourth conductor are arranged parallel to each other along the extending direction of the second current-carrying line and respectively wrap half of the second current-carrying line.

7. The power cord according to claim 5 or 6, characterized in that, An insulating layer is provided between the first conductor and the second conductor, and an insulating layer is provided between the third conductor and the fourth conductor.

8. A detection and protection device for a power cord according to any one of claims 1 to 7, characterized in that the first detection branch and the second detection branch are connected in series or in parallel to form a module to be detected, and the detection and protection device includes: a switch module for controlling the electrical connection between the input end and the output end of the power cord; an open-circuit detection module including a first resistor and a first switching tube, the first resistor being connected in parallel with the module to be detected, and the first resistor being further connected to the control pin of the first switching tube to control the first switching tube to act when an open circuit occurs in the module to be detected; a driving module connected to the switch module, the module to be detected, and the first switching tube, and configured to control the switch module to disconnect the electrical connection when the module to be detected detects a leakage current or the first switching tube acts.

9. The detection and protection device according to claim 8, characterized in that the driving module includes a switch trip driving unit, the switch trip driving unit includes a second switching tube and a coil for generating an electromagnetic force for driving the switch module, the second current-carrying line, the coil, the second switching tube, and the first current-carrying line are connected in sequence to form a trip control loop when the second switching tube is turned on.

10. The detection and protection device according to claim 9, characterized in that the driving module further includes a switching tube driving unit, the switching tube driving unit includes a second resistor and a third resistor connected in series, and the switch trip driving unit further includes a first diode and a second diode; the module to be detected is connected to the second resistor, the connection point of the second resistor and the third resistor is connected to the control pin of the second switching tube, and the third resistor is connected to the first current-carrying line through the first diode and to the connection point of the second switching tube and the coil through the second diode.

11. The detection and protection device according to claim 10, characterized in that the open-circuit detection module further includes a fourth resistor, one end of the fourth resistor is connected to the connection point of the first resistor and the second detection branch, and the other end is connected to the connection point of the second switching tube and the coil.

12. The detection and protection device according to claim 10, characterized in that the open-circuit detection module further includes a fifth resistor, one end of the fifth resistor is connected to the connection point of the first resistor and the first detection branch, and the other end is connected to the connection point of the third resistor and the first diode.

13. The detection and protection device according to claim 10, characterized in that the open-circuit detection module further includes a sixth resistor, and the connection point of the first resistor and the second detection branch is connected to the control pin of the first switching tube through the sixth resistor.

14. The detection and protection device according to claim 9, characterized in that It further includes a test switch, one end of the test switch is connected to the connection point between the first resistor and the module to be detected, and the other end is connected to the connection point between the second switching tube and the coil.

15. The detection and protection device according to claim 9, wherein, it further includes an LED indication unit connected in parallel with the second switching tube, and the LED indication unit includes a seventh resistor and a light-emitting diode connected in series.

16. An electrical connection device, wherein, it includes a housing, the power cord according to any one of claims 1 to 7, and the detection and protection device according to any one of claims 8 to 15. The detection and protection device is arranged in the housing, and the power cord is connected to the housing.

17. An electrical equipment, wherein, it includes a load device and the electrical connection device according to claim 16, and the power cord is connected to the load device.

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