CN221304326U

CN221304326U - Power line, detection protection device, electric connection equipment and electric equipment

Info

Publication number: CN221304326U
Application number: CN202323248803.2U
Authority: CN
Inventors: 牛力伟; 王华科
Original assignee: GD Midea Air Conditioning Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2023-11-29
Filing date: 2023-11-29
Publication date: 2024-07-09
Anticipated expiration: 2033-11-29

Abstract

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

Description

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

Technical Field

The present invention relates to the field of electronic circuits, and in particular, to a power cord, a detection protection device, an electrical connection device, and an electrical apparatus.

Background

The leakage current detection circuit breaker (Leakage Circuit Detector Interrupter, LCDI) is a power supply connection device for an electric appliance, can detect leakage current of a power line group through a leakage current detection line, and cuts off power supply connection of the electric appliance when a certain leakage current is detected, so that use safety is ensured.

In the existing leakage current detection circuit breaker, when a leakage current detection line of a live wire or a zero line in a power line is broken, an electric appliance can still supply power and output, and at the moment, the electric appliance may have potential safety hazards, but the leakage current detection circuit breaker of the related technology cannot reflect the situation of the leakage current detection line.

Disclosure of Invention

The invention aims to at least solve one of the technical problems in the prior art, and provides a power line, a detection protection device, electric connection equipment and electric equipment, which can effectively detect the current leakage condition of a current carrying line of the power line and the disconnection condition of a shielding conductor of the power line.

In a first aspect, an embodiment of the present invention provides a power cord, where an input end of the power cord is used for connecting with a detection protection device, and an output end of the power cord is used for connecting with electric equipment, and the power cord includes a first current-carrying wire and a second current-carrying wire;

The first current-carrying wire is externally coated with a first shielding module for detecting leakage current, the first shielding module comprises a first conductor and a second conductor which are mutually spaced, and one end of the first conductor, which is close to the output end, is connected with one end of the second conductor, which is close to the output end, so that the first conductor and the second conductor form a first detection branch;

the second current-carrying wire is externally coated with a second shielding module for detecting leakage current, the second shielding module comprises a third conductor and a fourth conductor which are mutually spaced, and one end of the third conductor, which is close to the output end, is connected with one end of the fourth conductor, which is close to the output end, so that the third conductor and the fourth conductor form a second detection branch;

Wherein:

The first detection branch and the second detection branch are connected with the detection protection device so as to output control signals under the condition that the first detection branch is open or the second detection branch is open.

The power line provided by the embodiment of the invention has at least the following beneficial effects: the first shielding module is arranged outside the first current carrying wire, and the second shielding module is arranged outside the second current carrying wire, so that the leakage condition of the first current carrying wire and the second current carrying wire can be effectively detected; the first shielding module and the second shielding module are respectively composed of two conductors which are spaced from each other, and one ends of the two conductors, which are close to the output end, are mutually connected to form a detection branch, so that two ends of the detection branch are arranged on one side of the input end, and the first detection branch and the second detection branch are conveniently connected with the detection protection device; when the first detection branch circuit is open or the second detection branch circuit is open, a control signal is output to the detection protection device, and the disconnection condition of the shielding conductor can be effectively detected.

According to some embodiments of the present invention, the first conductor is connected to the detection protection device at an end near the input end, the second conductor is connected to the third conductor at an end near the input end, and the fourth conductor is connected to the detection protection device at an end near the input end.

According to some embodiments of the present invention, the power line is provided, wherein the end of the first conductor near the input end is connected to the end of the third conductor near the input end and connected to the detection protection device, and the end of the second conductor near the input end is connected to the end of the fourth conductor near the input end and connected to the detection protection device.

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

According to some embodiments of the present invention, the first conductor and the second conductor are wound around the first current-carrying wire in parallel; the third conductor and the fourth conductor are wound outside the second current carrying wire in parallel.

According to the power line provided by some embodiments of the present invention, the first conductor and the second conductor are disposed parallel to each other along an extension 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 in parallel with each other along the extending direction of the second current-carrying line and respectively wrap half of the second current-carrying line.

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

In a second aspect, an embodiment of the present invention provides a detection protection device applied to the power line according to the embodiment of the first aspect, where the first detection branch and the second detection branch are connected in series or in parallel to form a detected module, and the detection protection device includes a switch module, an open circuit detection module, and a driving module, where:

the switch module is used for controlling the electric power connection between the input end and the output end of the power line;

The open circuit detection module comprises a first resistor and a first switching tube, the first resistor is connected with the detected module in parallel, and the first resistor is also connected to a control pin of the first switching tube so as to control the first switching tube to act under the condition that the detected module is open circuit;

The driving module is connected with the switch module, the detected module and the first switch tube and is used for controlling the switch module to disconnect the power connection under the condition that the detected module detects leakage current or the first switch tube acts.

The detection protection device for the power line provided by the embodiment of the invention has at least the following beneficial effects: the outside of two current-carrying lines of the power line are coated with shielding modules, and when the current-carrying lines generate electric leakage and are detected by the shielding modules, the driving module can control the switch module to disconnect the electric power connection between the input end and the output end of the power line, so that the detection and the treatment of the electric leakage condition are realized; in addition, still be provided with open circuit detection module, first detection branch road and second detection branch road establish ties or connect in parallel in order to form by the detection module, by detection module and first resistance parallelly connected for short circuit is carried out to first resistance when not appearing opening the circuit condition by the detection module, the electric current can not flow through first resistance, and when the open circuit condition appears by the detection module, the electric current can only flow through first resistance, thereby the control pin state of the first switch tube that makes to be connected with first resistance changes, lead to first switch tube action, and then the electric power connection between the input and the output of power cord is disconnected by drive module control switch module, realize the detection and the processing to the open circuit condition of being detected the module. In addition, the detection protection device for the power line is simple in circuit structure, low in cost and high in safety.

According to the detection protection device provided by some embodiments of the present invention, the driving module includes a switch trip driving unit, the switch trip driving unit includes a second switching tube and a coil for generating electromagnetic force for driving the switching module, and the second current-carrying wire, the coil, the second switching tube and the first current-carrying wire are sequentially connected to form a trip control loop when the second switching tube is turned on.

According to the detection protection device provided by 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 switching trip driving unit further includes a first diode and a second diode; the detected module is connected to the second resistor, a connection point of the second resistor and the third resistor is connected to a control pin of the second switching tube, and the third resistor is connected to the first current-carrying wire through the first diode and to a connection point of the second switching tube and the coil through the second diode.

According to the detection protection device provided by 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 a connection point of the first resistor and the second detection branch, and the other end of the fourth resistor is connected to a connection point of the second switching tube and the coil.

According to the detection protection device provided by 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 a connection point between the first resistor and the first detection branch, and the other end of the fifth resistor is connected to a connection point between the third resistor and the first diode.

According to the detection protection device provided by some embodiments of the present invention, the open circuit detection module further includes a sixth resistor, and a connection point of the first resistor and the second detection branch is connected to the control pin of the first switch tube through the sixth resistor.

According to some embodiments of the present invention, the detection protection device further includes a test switch, one end of the test switch is connected to a connection point between the first resistor and the detected module, and the other end of the test switch is connected to a connection point between the second switch tube and the coil.

According to some embodiments of the present invention, the detection protection device further includes an LED indication unit connected in parallel with the second switching tube, where the LED indication unit includes a seventh resistor and a light emitting diode connected in series.

In a third aspect, an embodiment of the present invention provides an electrical connection device, including a housing, a power cord according to the embodiment of the first aspect, and a detection protection device according to the embodiment of the second aspect, where the detection protection device is disposed in the housing, and the power cord is connected to the housing.

In a fourth aspect, an embodiment of the present invention provides an electrical apparatus, including a load device and an electrical connection device according to an embodiment of the third aspect, where the power cord is connected to the load device.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.

The invention is further described below with reference to the drawings and examples;

FIG. 1 is a schematic diagram of the overall connection of a power line and a detection protection device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the overall connection of a power line and a detection protection device according to another embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a power cord provided in one embodiment of the invention;

FIG. 4 is a schematic diagram of a first shielding module and a second shielding module provided by one embodiment of the present invention;

FIG. 5 is a schematic diagram of a shielding module according to another embodiment of the present invention;

FIG. 6 is a schematic diagram of a power line and a detection protection device according to an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a power cord and a detection protection device according to another embodiment of the present invention;

Fig. 8 is a schematic structural view of an electrical connection device according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.

In the description of the embodiments of the present invention, the meaning of several is one or more, the meaning of several is two or more, greater than, less than, exceeding, etc. are understood to exclude the present number, the above, below, within, etc. are understood to include the present number, and "at least one" means one or more, and "at least one item below" and the like, means any combination of these items, including any combination of single items or plural items. If any, the terms "first," "second," etc. are used for distinguishing between technical features only, and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

It should be noted that, in the embodiments of the present invention, terms such as setting, installing, connecting and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the foregoing terms in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "coupled" may be a mechanical connection, an electrical connection, or may be in communication with one another; can be directly connected or indirectly connected through an intermediate medium.

The technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

The utility model provides a leakage detection protection device of power cord (abbreviated as "LCDI device" below) is a kind of safety protection device of using electric fire, and its main structure is the power cord with plug, and the main function is to detect that the power plug takes place leakage current to between the wire live wire of power cord, zero line etc. and the wire inoxidizing coating (shielding) between the load electrical apparatus (for example air conditioner, dehumidifier) to cut off the consumer power, prevent the production of conflagration, in order to provide safety protection. Accordingly, the LCDI device can prevent arc fault fires caused by damage to the power line, a decrease in insulation strength, and the like due to live (L line), neutral (N line), ground wire aging, wear, extrusion, or animal biting among the power lines. In the existing LCDI device, when the leakage current detection line of the live wire or the zero wire in the power line does not have a protection function due to open circuit or broken circuit, the product can still supply power and output, so that fire or other potential safety hazards exist. Therefore, there is a need for a power line leakage detection protection device capable of detecting a leakage current detection line.

Based on the above, the embodiment of the invention provides a power line, a detection protection device, an electric connection device and electric equipment, which can effectively detect the current leakage condition of a current carrying line of the power line and the disconnection condition of a shielding conductor of the power line; in addition, the detection protection device for the power line is simple in circuit structure, low in cost and high in safety.

Embodiments of the present invention will be further described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the overall connection of a power line and a detection protection device according to an embodiment of the present invention; FIG. 2 is a schematic diagram of the overall connection of a power line and a detection protection device according to another embodiment of the present invention; fig. 3 is a schematic cross-sectional view of a power cord provided in one embodiment of the present invention.

Referring to fig. 1 to 3, an embodiment of a first aspect of the present invention provides a power cord, an input end of the power cord is used for connecting with a detection protection device 100, an output end of the power cord is used for connecting with electric equipment, and the power cord includes a first current-carrying line L and a second current-carrying line N. It is understood that the power supply line may further include a third current carrying line PE serving as a ground line, and that the first current carrying line L, the second current carrying line N and the third current carrying line PE are each provided with respective insulation layers on the outside thereof. It should be noted that if the power line supplies power to the electric device using three-phase alternating current, the power line may further include a fourth current carrying line and a fifth current carrying line as the other two live lines. In the following, a description will be given by taking an example in which the power supply line includes a first current line L and a second current line N.

The first current line L is externally coated with a first shielding module 200 for detecting leakage current, and when leakage of the first current line L is detected by the first shielding module 200, the first shielding module 200 can output a leakage current detection signal to the detection protection device 100 so that the detection protection device 100 processes the leakage condition of the first current line L. As shown in fig. 4, the first shielding module 200 includes a first conductor 210 and a second conductor 220 spaced apart from each other, and an end a2 of the first conductor 210 near the output end is connected to an end b2 of the second conductor 220 near the output end, so that the first conductor 210 and the second conductor 220 form a first detection branch; it should be further noted that, the end of the first conductor 210 near the input end is denoted as an a1 end, and the end of the second conductor 220 near the input end is denoted as a b1 end, and the first detection branch is a conductor branch from the a1 end of the first conductor 210 to the a2 end of the first conductor 210 to the b2 end of the second conductor 220 to the b1 end of the second conductor 220.

The second current wire N is wrapped with a second shielding module 300 for detecting leakage current, and when leakage current occurs in the second current wire N and is detected by the second shielding module 300, the second shielding module 300 can output a leakage current detection signal to the detection protection device 100, so that the detection protection device 100 processes the leakage current condition of the second current wire N. As shown in fig. 4, the second shielding module 300 includes a third conductor 310 and a fourth conductor 320 spaced apart from each other, and an end of the third conductor 310 near the output end is connected to an 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 be further noted that, where an end of the third conductor 310 near the input end is denoted as c1 end, and an end of the fourth conductor 320 near the input end is denoted as d1 end, the second detection branch is a conductor branch from the c1 end of the fourth conductor 320 to the c2 end of the fourth conductor 320 to the d1 end of the fourth conductor 320.

The first detection branch and the second detection branch are both connected to the detection protection device 100 to output a control signal in case the first detection branch is open or in case the second detection branch is open. It will be appreciated that the first detection branch and the second detection branch may be connected in series first and then connected to the detection protection device 100, for example as shown in fig. 1; the first detection branch and the second detection branch may be connected in parallel and then connected to the detection protection device 100, for example, as shown in fig. 2.

According to the power line provided by the embodiment of the invention, the first shielding module 200 is arranged outside the first current-carrying line L, and the second shielding module 300 is arranged outside the second current-carrying line N, so that the electric leakage condition of the first current-carrying line L and the second current-carrying line N can be effectively detected; the first shielding module 200 and the second shielding module 300 are both composed of two conductors spaced apart from each other, and one ends of the two conductors close to the output end are connected to each other to form a detection branch, so that both ends of the detection branch are on one side of the input end, and the first detection branch and the second detection branch are convenient to connect with the detection protection device 100; when the first detection branch circuit is open or the second detection branch circuit is open, a control signal is output to the detection protection device 100, so that the disconnection of the shielding conductor can be effectively detected.

It should be further noted that, referring to fig. 3, the insulating layer 230 is disposed outside the first current-carrying line L, the first shielding module 200 formed by the first conductor 210 and the second conductor 220 is wrapped outside the insulating layer 230, and the insulating layer 240 is further disposed outside 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, the second current-carrying wire N is provided with an insulating layer 330 outside, the second shielding module 300 formed by the third conductor 310 and the fourth conductor 320 is wrapped outside the insulating layer 330, and an insulating layer 340 is further provided outside the second shielding module 300, that is, the insulating layer 340 wraps the second current-carrying wire N, the insulating layer 330 and the second shielding module 300 at the same time. In addition, the power line is further 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, and it is understood that the 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 may be filled with an insulator.

The power cord shown in fig. 3 has a circular cross-sectional shape. It should be noted that, the circular shape is one of the cross-sections of the power lines, and the cross-section of the power lines may be square, elliptical, polygonal or other irregular patterns.

The materials of the first conductor 210, the second conductor 220, the third conductor 310 and the fourth conductor 320 may be metals, for example, but not limited to, gold, silver, copper, iron, aluminum, alloy, etc.; the materials of the first conductor 210, the second conductor 220, the third conductor 310 and the fourth conductor 320 may also be semiconductor materials, for example, but not limited to carbon, silicon, germanium, graphene, etc.

Referring to fig. 1, in the power cord according to some embodiments of the present invention, an end a1 of the first conductor 210 near the input end is connected to the detection protection device 100, an end b1 of the second conductor 220 near the input end is connected to an end c1 of the third conductor 310 near the input end, and an end d1 of the fourth conductor 320 near the input end is connected to the detection protection device 100.

It will be appreciated that in the embodiment shown in fig. 1, the first detection branch and the second detection branch are connected in series to form a detected module, and the detected module is a conductor branch from the a1 end of the first conductor 210 to the a2 end of the first conductor 210 to the b2 end of the second conductor 220 to the b1 end of the second conductor 220 to the c1 end of the fourth conductor 320 to the c2 end of the fourth conductor 320 to the d1 end of the fourth conductor 320, and both ends of the detected module are respectively connected to the detection 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 protection device 100.

Referring to fig. 2, in the power cord according to some embodiments of the present invention, an end a1 of the first conductor 210 near the input end is connected to the detection protection device 100 and an end c1 of the third conductor 310 near the input end, and an end b1 of the second conductor 220 near the input end is connected to the detection protection device 100 and an end d1 of the fourth conductor 320 near the input end.

It will be appreciated that in the embodiment shown in fig. 2, the first detection branch and the second detection branch are connected in parallel to form a detected module, and two ends of the detected module are respectively connected to the detection protection device 100.

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

In the present embodiment, the outer portions of the first conductor 210, the second conductor 220, the third conductor 310 and the fourth conductor 320 are all coated with the insulating layer, so that the first conductor 210 and the second conductor 220 which are arranged side by side are insulated from each other except for the connection point, and the third conductor 310 and the fourth conductor 320 which are arranged side by side are insulated from each other except for the connection point, the first conductor 210 and the second conductor 220 are parallel to each other and are coated outside 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 coated outside the second current-carrying line N in a spiral winding manner.

The first conductor 210, the second conductor 220, the third conductor 310, and the fourth conductor 320 may be a conductor woven from a plurality of thin strips, or may be a single conductor of various shapes.

Referring to fig. 4, in the power line 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 be simply conductors, and the outside is not covered with an insulating layer, 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 in parallel outside the first current-carrying wire L; the third conductor 310 and the fourth conductor 320 are wound in parallel outside the second current-carrying wire N. At this time, an insulating layer is required to be disposed between the first conductor 210 and the second conductor 220, and an insulating layer is required to be disposed between the third conductor 310 and the fourth conductor 320, so as to avoid the first conductor 210 and the second conductor 220 from contacting each other except for the connection point, and avoid the third conductor 310 and the fourth conductor 320 from contacting each other except for the connection point, thereby ensuring that the open circuit condition of each position of the first detection branch and the second detection branch can be effectively detected.

Referring to fig. 5, in the power line provided in some embodiments of the present invention, the first conductor 210 and the second conductor 220 are disposed 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 disposed parallel to each other along the extending direction of the second current-carrying line N and respectively wrap around half of the second current-carrying line N.

In this embodiment, the first conductor 210 and the second conductor 220 do not include the first current line L in a spiral winding manner, but use a special shape to fit around the first current line L, for example, as shown with reference to fig. 5, the first conductor 210 and the second conductor 220 respectively take the shape of half of a cylinder; similarly, the third conductor 310 and the fourth conductor 320 do not include the second current-carrying wire N in a spiral winding manner, but are specially shaped to fit around the second current-carrying wire N, for example, as shown with reference to fig. 5, the third conductor 310 and the fourth conductor 320 respectively take the shape of half of a cylinder. In order to avoid that the first conductor 210 and the second conductor 220 are in contact with each other at other positions than the connection point and the third conductor 310 and the fourth conductor 320 are in contact with each other at other positions than the connection point when the power line is bent, twisted, folded, or the like, an insulating layer may be provided between the first conductor 210 and the second conductor 220 and an insulating layer may be provided between the third conductor 310 and the fourth conductor 320.

Referring to fig. 6 and 7, a second aspect embodiment of the present invention provides a detection protection device 100 applied to the power line of the first aspect embodiment above, the first detection branch and the second detection branch being connected in series or in parallel to form a detected module, the detection protection device 100 including a switching module 110, an open circuit detection module 120, and a driving module 130, wherein:

the switch module 110 is used for controlling the electric power connection between the input end and the output end of the power line;

The open circuit detection module 120 includes a first resistor R1 and a first switching tube Q1, where the first resistor R1 is connected in parallel with the detected module, and the first resistor R1 is further connected to a control pin of the first switching tube Q1 to control the first switching tube Q1 to act when the detected module is open;

The driving module 130 is connected to the switching module 110, the detected module, and the first switching tube Q1, and is configured to control the switching module 110 to disconnect power when the detected module detects a leakage current or the first switching tube Q1 operates.

According to the detection protection device 100 for a power line provided by the embodiment of the invention, the shielding modules are coated on the outer parts of two current carrying lines of the power line, and when the current carrying lines are leaked and detected by the shielding modules, the driving module 130 can control the switch module 110 to disconnect the power connection between the input end and the output end of the power line, so as to realize detection and treatment of the leakage condition; in addition, an open circuit detection module 120 is further provided, the first detection branch and the second detection branch are connected in series or in parallel to form a detected module, the detected module is connected in parallel with the first resistor R1, so that when the detected module does not have an open circuit condition, the first resistor R1 is not in short circuit, and when the detected module has an open circuit condition, the current can only flow through the first resistor R1, so that the control pin state of the first switching tube Q1 connected with the first resistor R1 is changed, the first switching tube Q1 is caused to act, and the driving module 130 controls the switching module 110 to disconnect the power connection between the input end and the output end of the power line, thereby realizing detection and processing of the open circuit condition of the detected module. In addition, the detection protection device 100 for the power line provided by the embodiment of the invention has the advantages of simple circuit structure, low cost and high safety.

Referring to fig. 6 and 7, in the detection protection device 100 provided in some embodiments of the present invention, the driving module 130 includes a switch trip driving unit 131, and the switch trip driving unit 131 includes a second switching tube Q2 and a coil Lx for generating electromagnetic force for driving the switching module 110, and the second current line N, the coil Lx, the second switching tube Q2, and the first current line L are sequentially connected to form a trip control loop when the second switching tube Q2 is turned on. The first switching transistor Q1 and the second switching transistor Q2 may be any one of thyristors, bipolar transistors, and field effect transistors.

It can be understood that when the first detection branch detects that the first current carrying line L in the power line has a leakage current, or when the second detection branch detects that the second current carrying line N in the power line has a leakage current, the detected module generates a leakage current signal with a higher voltage level, and can trigger the second switching tube Q2 to be turned on, so as to form a trip control loop, so that the coil Lx is electrified to generate electromagnetic force to drive the switching module 110 to act, and the power connection between the input end and the output end of the power line is cut off; similarly, when the detected module has an open circuit condition, the control pin state of the first switching tube Q1 changes, so that the first switching tube Q1 is turned on, and the second switching tube Q2 can be triggered to be turned on, so as to form a tripping control loop, enable the coil Lx to be electrified to generate electromagnetic force, drive the switching module 110 to act, and cut off the power connection between the input end and the output end of the power line.

Referring to fig. 6 and 7, in the detection protection device 100 provided in some embodiments of the present invention, the driving module 130 further includes a switching tube driving unit 132, the switching tube driving unit 132 includes a second resistor R2 and a third resistor R3 connected in series, and the switching 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, a connection point of the second resistor R2 and the third resistor R3 is connected to a control pin of the second switching tube Q2, and the third resistor R3 is connected to the first current-carrying line L through the first diode D1 and to a connection point of the second switching tube Q2 and the coil Lx through the second diode D2. In the embodiment shown in fig. 6, the a1 end of the first conductor 210 near the input end is connected to one end of the first resistor R1 and to 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 to a control pin of the second switching tube Q2, the other end of the third resistor R3 is simultaneously connected to one switching pin of the second switching tube Q2, 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 L, the cathode of the second diode D2 is connected with the other switching pin of the second switching tube Q2 and is connected to one end of the coil Lx, and the other end of the coil Lx is connected to the second current-carrying line N. In addition, in the embodiment shown in fig. 7, the a1 end of the first conductor 210 near the input end is connected to one end of the ninth resistor R9, the c1 end of the third conductor 310 near the input end is connected to one end of the tenth resistor R10, the other end of the ninth resistor R9 and the other end of 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 to a control pin of the second switching tube Q2, the other end of the third resistor R3 is simultaneously connected to one switching pin of the second switching tube 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 streamline L, the negative electrode of the second diode D2 and the other switching pin of the second switching tube Q2 are connected together and to the other end of the current-carrying coil Lx, and the other end of the current carrying coil Lx is connected to the other end of the current carrying coil Lx.

It can be understood that when the first current line L has a leakage current to the first conductor 210 or the second conductor 220, a current loop is formed, which flows to the first current line L, the first conductor 210/the second conductor 220, the second resistor R2, the third resistor R3, the second diode D2, the coil Lx, and the second current line N, so that under the voltage division effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching tube Q2 is raised to trigger conduction, and a trip control loop is formed, which flows to the second current line N, the coil Lx, the second switching tube Q2, the first diode D1, and the first current line L, so that the coil Lx is electrified to generate electromagnetic force to drive the switching module 110 to act, and the power connection between the input end and the output end of the power line is cut off; similarly, when the second current-carrying line N has a leakage current to the third conductor 310 or the fourth conductor 320, a current loop is formed, which flows to the second current-carrying line N, the third conductor 310/the fourth conductor 320/the first conductor 210/the second conductor 220, the second resistor R2, the third resistor R3, the first diode D1, and the first current-carrying line L, so that under the voltage division effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching tube Q2 is increased to trigger the conduction, and a trip control loop is formed, which flows to 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, so that the coil Lx is electrified to generate electromagnetic force to drive the switching module 110 to act, and the power connection between the input end and the output end of the power line is cut off.

Referring to fig. 6 and fig. 7, in the detection protection device 100 provided in some embodiments of the present invention, the open circuit detection module 120 further includes a fourth resistor R4, where one end of the fourth resistor R4 is connected to a connection point of the first resistor R1 and the second detection branch, and the other end is connected to a connection point of the second switching tube Q2 and the coil Lx.

It can be understood that when the detected module formed by the first detecting branch and the second detecting branch is not disconnected, the detected module is connected in parallel with the first resistor R1, so as to short-circuit the first resistor R1, and a current loop with the second current 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 line L is formed, and by reasonably configuring the resistance values of the fourth resistor R4, the second resistor R2 and the third resistor R3, the voltage of the control pin of the first switch tube Q1 is low enough to be insufficient to turn on the first switch tube Q1 when the detected module is not disconnected; when the detected module is disconnected, a current loop with 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 is formed, and under the partial pressure action of the first resistor R1 and the fourth resistor R4, the voltage of the control pin of the first switching tube Q1 is increased to trigger the connection; then, a current loop with the flow 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, so that under the partial pressure action of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching tube Q2 is increased to trigger conduction, and a tripping control loop with the flow 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 is formed, so that the coil Lx is electrified to generate electromagnetic force to drive the switching module 110 to act, and the electric power connection between the input end and the output end of the power line is cut off.

Referring to fig. 6 and fig. 7, in the detection 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.

It can be understood that the fifth resistor R5 is provided, and the fifth resistor R5 is equivalent to a branch circuit formed by the second resistor R2 and the third resistor R3 in parallel, so that when the detected module is disconnected, a current loop with the directions 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 can be formed instead of the second resistor R2 and the third resistor R3.

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

It can be appreciated that, by setting the sixth resistor R6 as the input resistor of the control pin of the first switching tube Q1, it is possible to avoid the first switching tube Q1 from being damaged due to the larger voltage impact generated when the first shielding module 200 and the second shielding module 300 detect the leakage current of the current line, and the sixth resistor R6 can play a better role in protecting the first switching tube Q1.

Referring to fig. 6 and 7, in the detection protection device 100 provided in some embodiments of the present invention, the switching tube driving unit 132 further includes a first capacitor C1 connected in parallel with the third resistor R3. In addition, it can be seen that the detection protection device further comprises a lightning protection unit 150, the lightning protection unit 150 comprising a first varistor ZR1 arranged between the first current line L and the second current line N; the switch trip driving unit 131 further includes a second varistor ZR2 connected in parallel with the second switching tube Q2. It will be appreciated that a varistor is a resistive device with non-linear volt-ampere characteristics, and is primarily used to clamp the voltage when the circuit is subjected to an overvoltage, absorbing excess current to protect sensitive devices.

Referring to fig. 6 and fig. 7, in the detection protection device 100 provided in some embodiments of the present invention, a TEST switch TEST is further included, where one end of the TEST switch TEST is connected to a connection point between the first resistor R1 and the detected module, and the other end of the TEST switch TEST is connected to a connection point between the second switch Q2 and the coil Lx.

It can be understood that when the TEST switch TEST is pressed, a current loop is formed, which flows to the second current carrying line N, the coil Lx, the TEST switch TEST, the first wire 310, the first shielding module 200/the second shielding module 300, the second resistor R2, the third resistor R3, the first diode D1, and the first current carrying line L, so that under the voltage division effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching tube Q2 is increased to trigger conduction, and a trip control loop is formed, which flows to 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, so that the coil Lx is electrified to generate electromagnetic force to drive the switching module 110 to act, and the power connection between the input end and the output end of the power line is cut off.

Referring to fig. 6 and 7, in the detection protection device 100 provided in some embodiments of the present invention, an LED indicating unit 140 connected in parallel to the second switching tube Q2 is further included, where the LED indicating unit 140 includes a seventh resistor R7 and a light emitting diode LED1 connected in series. It can be further seen that the LED indicating unit 140 further includes an eighth resistor R8, a 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 line L.

It can be understood that when the first switching tube Q1 and the second switching tube Q2 are not turned on, that is, when the first shielding module 200 and the second shielding module 300 do not detect the leakage current and the detected module formed by the first detection branch and the second detection branch is not turned off, 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 turned on; when the second switching tube Q2 is turned on, the LED indication unit 140 is correspondingly shorted, the light emitting diode LED1 is no longer turned on, and when the second switching tube Q2 is turned on, the switching module 110 is controlled to be turned on, the power connection between the input end and the output end of the power line is cut off, and the light emitting diode LED1 is also not turned on any more when the power supply is lost.

Referring to fig. 8, a third aspect embodiment of the present invention provides an electrical connection apparatus 800 including a housing 810, a power line 820 according to the first aspect embodiment, and a detection protection device 100 according to the second aspect embodiment, wherein the detection protection device 100 is disposed in the housing 810, and the power line 820 is connected to the housing 810.

It is understood that the housing 810 is internally provided with a PCB board, and the circuit components included in the detection and protection device 100 are disposed on the PCB board. In fig. 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, and the connection manner between the a1 end of the first conductor 210 and the d1 end of the fourth conductor 320 and the PCB includes, but is not limited to, welding, pin, locking plate, etc.; similarly, in fig. 7, the a1 end of the first conductor 210 near the input end, the b1 end of the second conductor 220 near the input end, the c1 end of the third conductor 310 near the input end, and the d1 end of the fourth conductor 320 near the input end are all connected to the PCB, and the connection manners 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 include, but are not limited to, soldering, inserting pins, locking pieces, and the like.

In a fourth aspect, embodiments of the present invention provide a powered device comprising a load device and an electrical connection device 800 as in the embodiment of the third aspect above, the power line 820 being connected to the load device.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.

Claims

1. The utility model provides a power cord, its characterized in that, the input of power cord is used for connecting and detects protection device, and the output is used for connecting the consumer, the power cord includes:

The first current-carrying wire is coated with a first shielding module for detecting leakage current, the first shielding module comprises a first conductor and a second conductor which are mutually spaced, one end of the first conductor, which is close to the output end, is connected with one end of the second conductor, which is close to the output end, so that the first conductor and the second conductor form a first detection branch;

The second current-carrying wire is coated with a second shielding module for detecting leakage current, the second shielding module comprises a third conductor and a fourth conductor which are mutually spaced, and one end of the third conductor, which is close to the output end, is connected with one end of the fourth conductor, which is close to the output end, so that the third conductor and the fourth conductor form a second detection branch;

Wherein:

2. The power cord according to claim 1, wherein an end of the first conductor near the input end is connected to the detection protection device, an end of the second conductor near the input end is connected to an end of the third conductor near the input end, and an end of the fourth conductor near the input end is connected to the detection protection device.

3. The power cord according to claim 1, wherein an end of the first conductor near the input end is connected to the detection protection device with an end of the third conductor near the input end, and an end of the second conductor near the input end is connected to the detection protection device with an end of the fourth conductor near the input end.

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

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

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 extension 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 in parallel with 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 test protection device for use with the power cord of any one of claims 1 to 7, wherein the first test leg and the second test leg are connected in series or in parallel to form a tested module, the test protection device comprising:

The open circuit detection module comprises a first resistor and a first switching tube, wherein the first resistor is connected with the detected module in parallel, and the first resistor is also connected to a control pin of the first switching tube so as to control the first switching tube to act under the condition that the detected module is open circuit;

The driving module is connected with the switch module, the detected module and the first switch tube and used for controlling the switch module to disconnect the power connection under the condition that the detected module detects leakage current or the first switch tube acts.

9. The protection device according to claim 8, wherein the driving module includes a switch trip driving unit including a second switching tube and a coil for generating electromagnetic force for driving the switching module, the second current-carrying wire, the coil, the second switching tube, and the first current-carrying wire being sequentially connected to form a trip control loop when the second switching tube is turned on.

10. The protection device of claim 9, wherein the drive module further comprises a switching tube drive unit comprising a second resistor and a third resistor in series, the switching trip drive unit further comprising a first diode and a second diode; the detected module is connected to the second resistor, a connection point of the second resistor and the third resistor is connected to a control pin of the second switching tube, and the third resistor is connected to the first current-carrying wire through the first diode and to a connection point of the second switching tube and the coil through the second diode.

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

12. The protection device of claim 10, wherein the open circuit detection module further comprises a fifth resistor, one end of the fifth resistor is connected to a connection point of the first resistor and the first detection branch, and the other end is connected to a connection point of the third resistor and the first diode.

13. The protection device of claim 10, wherein the open circuit detection module further comprises a sixth resistor, and wherein 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 test protection device of claim 9, further comprising a test switch having one end connected to a connection point of the first resistor and the tested module and another end connected to a connection point of the second switching tube and the coil.

15. The protection device of claim 9, further comprising an LED indication unit in parallel with the second switching tube, the LED indication unit comprising a seventh resistor and a light emitting diode in series.

16. An electrical connection apparatus comprising a housing, a power cord as claimed in any one of claims 1 to 7 and a test protection device as claimed in any one of claims 8 to 15, the test protection device being disposed in the housing, the power cord being connected to the housing.

17. A powered device comprising a load device and the electrical connection device of claim 16, the power cord connected to the load device.