Detection protection device of power line, electric connection equipment and electric equipment

Abstract

The invention discloses a detection and protection device of a power line, electric connection equipment and electric equipment, the detection and protection device comprises a switch module, a leakage current detection line, an open circuit detection module and a driving module, and the leakage current detection line wraps a current-carrying line in the power line; the open circuit detection module comprises a first wire, a first resistor and a first switch tube, the first wire is connected with the leakage current detection line to form a detection loop, the first resistor is connected with the detection loop in parallel, and the first resistor is further connected to a control pin of the first switch tube so as to control the first switch tube to be switched on under the condition that the detection loop is open; the driving module is connected with the switch module, the leakage current detection line and the first switch tube, and is used for controlling the switch module to disconnect the power connection under the condition that the leakage current detection line detects the leakage current or the first switch tube is conducted; the electric leakage condition of the current-carrying line of the power line and the disconnection condition of the leakage current detection line of the power line can be effectively detected.

Description

Technical Field

[0001] The present invention relates to the electrical field, and in particular to a detection and protection device for a power line, an electrical connection device and an electrical device. Background Art

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

[0003] In the existing leakage current detection circuit breaker, when the leakage current detection line of the live wire or the neutral wire in the power cord is broken, the appliance can still output power. At this time, the appliance may have a safety hazard in electricity use, but the leakage current detection circuit breaker of the related technology cannot reflect the situation of the leakage current detection line. Summary of the invention

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

[0005] In a first aspect, an embodiment of the present invention provides a detection and protection device for a power line, including a switch module, a leakage current detection line, an open circuit detection module and a drive module, wherein:

[0006] The switch module is used to control the power connection between the input end and the output end of the power line;

[0007] The leakage current detection line covers the current-carrying line in the power line, and is used to detect whether there is leakage current in the current-carrying line;

[0008] The open circuit detection module includes a first wire, a first resistor and a first switch tube, wherein the first wire is connected with the leakage current detection line to form a detection loop, the first resistor is connected in parallel with the detection loop, and the first resistor is also connected to a control pin of the first switch tube to control the first switch tube to be turned on when an open circuit occurs in the detection loop;

[0009] The driving module is connected to the switch module, the leakage current detection line and the first switch tube, and is used to control the switch module to disconnect the power connection when the leakage current detection line detects leakage current or the first switch tube is turned on.

[0010] The detection and protection device for power lines provided by the embodiment of the present invention has at least the following beneficial effects: the outer part of the current-carrying line of the power line is covered with a leakage current detection line, and when the current-carrying line has leakage and is detected by the leakage current detection line, the driving module can control the switch module to disconnect the power connection between the input end and the output end of the power line, so as to detect and process the leakage situation; in addition, an open circuit detection module is also provided, wherein the first wire is connected with the leakage current detection line to form a detection loop, and the detection loop is connected in parallel with the first resistor, so that when the detection loop does not have an open circuit, the first resistor is short-circuited, and the current does not flow through the first resistor, and when the detection loop has an open circuit, the current can only flow through the first resistor, so that the control pin state of the first switch tube connected to the first resistor changes, causing the first switch tube to be turned on, and then the driving module controls the switch module to disconnect the power connection between the input end and the output end of the power line, so as to detect and process the disconnection of the detection loop. In addition, the detection and protection device for power lines provided by the embodiment of the present invention has a simple circuit structure, low cost and high safety.

[0011] According to the detection and protection device provided in some embodiments of the present invention, the power line includes a first current-carrying line and a second current-carrying line; the driving module includes a switch tripping driving unit, the switch tripping driving unit includes a second switch tube and a coil for generating an electromagnetic force to drive the switch module, and the second current-carrying line, the coil, the second switch tube, and the first current-carrying line are connected in sequence to form a tripping control loop when the second switch tube is turned on.

[0012] According to the detection protection device provided by some embodiments of the present invention, the driving module also includes a switch tube driving unit, the switch tube driving unit includes a second resistor and a third resistor connected in series, and the switch tripping driving unit also includes a first diode and a second diode; the leakage current detection line 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 switch tube, and the third resistor is connected to the first current-carrying line through the first diode and to the connection point between the second switch tube and the coil through the second diode.

[0013] According to the detection protection device provided by some embodiments of the present invention, the open circuit detection module also includes a fourth resistor, one end of the fourth resistor is connected to the connection point between the first resistor and the first wire, and the other end is connected to the connection point between the second switch tube and the coil.

[0014] According to the detection protection device provided by some embodiments of the present invention, the open circuit detection module also includes a fifth resistor, one end of the fifth resistor is connected to the connection point between the first resistor and the leakage current detection line, and the other end is connected to the connection point between the third resistor and the first diode.

[0015] 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 between the first resistor and the first wire is connected to a control pin of the first switch tube through the sixth resistor.

[0016] According to the detection protection device provided by some embodiments of the present invention, the switch tube driving unit also includes a first capacitor connected in parallel with the third resistor.

[0017] The detection protection device provided according to some embodiments of the present invention further includes a test switch, one end of which is connected to a connection point between the first resistor and the detection loop, and the other end of which is connected to a connection point between the second switch tube and the coil.

[0018] 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 switch tube, and the LED indication unit includes a seventh resistor and a light emitting diode connected in series.

[0019] In a second aspect, an embodiment of the present invention provides an electrical connection device, comprising a shell, a power cord connected to the shell, and a detection and protection device as described in the embodiment of the first aspect above, wherein the switch module, the open circuit detection module and the drive module are arranged in the shell, and the leakage current detection line and the first conductor are located in the power cord.

[0020] According to some embodiments of the present invention, the electrical connection device includes a first current-carrying wire and a second current-carrying wire, and the leakage current detection line includes a first shielding conductor wrapping the first current-carrying wire and a second shielding conductor wrapping the second current-carrying wire, and the first shielding conductor and the second shielding conductor are in contact with each other on the outside.

[0021] According to the electrical connection device provided by some embodiments of the present invention, the leakage current detection line further includes a third shielding conductor that wraps the first shielding conductor and the second shielding conductor at the same time, and the third shielding conductor is in contact with the first shielding conductor and the second shielding conductor at the same time.

[0022] According to some embodiments of the present invention, the electrical connection device comprises a first current-carrying wire and a second current-carrying wire, and the leakage current detection line comprises a third shielding conductor that wraps both the first current-carrying wire and the second current-carrying wire.

[0023] According to the electrical connection device provided by some embodiments of the present invention, a first insulating layer is provided between the first current-carrying line and the first shielding conductor, and a second insulating layer is provided between the second current-carrying line and the second shielding conductor.

[0024] In a third aspect, an embodiment of the present invention provides an electrical device, comprising a load device and the electrical connection device as described in the embodiment of the second aspect above, wherein the output end of the power line is connected to the load device.

[0025] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the technical solution 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 solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0028] Figure 1 is a circuit schematic diagram of a detection and protection device for a power line provided by an embodiment of the present invention;

[0029] Figure 2 It is a principle block diagram of a detection and protection device for a power line provided by an embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of the appearance of an electrical connection device provided by an embodiment of the present invention;

[0031] Figure 4 is a schematic cross-sectional view of a power cord provided by an embodiment of the present invention;

[0032] Figure 5 is a schematic cross-sectional view of a power cord provided by another embodiment of the present invention;

[0033] Figure 6 FIG. 4 is a schematic cross-sectional view of a power cord provided in yet another embodiment of the present invention. DETAILED DESCRIPTION

[0034] 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 purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0035] In the description of the embodiments of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "at least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] It should be noted that the terms such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense, and 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 "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0037] 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.

[0038] A leakage current detection and protection device for a power line (hereinafter referred to as an "LCDI device") is a fire safety protection device for electrical use. Its main structure is a power line with a plug. Its main function is to detect leakage current between the live wire, neutral wire, etc. of the power line between the power plug and the load electrical appliance (such as an air conditioner or dehumidifier) ​​and the wire protective layer (shield), and to cut off the power supply of the electrical equipment to prevent the occurrence of a fire, thereby providing safety protection. Therefore, the LCDI device can prevent arc fault fires caused by damage to the power line and reduced insulation strength due to aging, wear, extrusion, or animal bites of the live wire (L line), neutral wire (N line), and ground wire in the power line. In the existing LCDI device, when the leakage current detection line of the live wire or neutral wire in the power line does not have a protection function due to an open circuit or a disconnection, the product can still supply power, so there is a hidden danger of fire or other electrical safety. Therefore, there is an urgent need for a power line leakage current detection and protection device that can detect the leakage current detection line.

[0039] Based on this, an embodiment of the present invention provides a power line detection and protection device, an electrical connection device and an electrical equipment, which can effectively detect the leakage of the current-carrying wire of the power line and the disconnection of the leakage current detection wire of the power line; in addition, the power line detection and protection device provided by the embodiment of the present invention has a simple circuit structure, low cost and high safety.

[0040] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0041] Figure 1 is a circuit schematic diagram of a detection and protection device for a power line provided by an embodiment of the present invention; Figure 2 The invention is a block diagram of a power line detection and protection device provided by an embodiment of the present invention.

[0042] Reference Figure 1 and Figure 2 The first aspect of the present invention provides a detection and protection device for a power line, comprising a switch module 100, a leakage current detection line 200, an open circuit detection module 300 and a driving module 400, wherein:

[0043] The switch module 100 is used to control the power connection between the input end and the output end of the power line; it should be noted that, in general, the power line includes a first current-carrying line L as a live line and a second current-carrying line N as a neutral line; if the power line supplies power to a power-consuming device using three-phase alternating current, the power line may also include a third current-carrying line and a fourth current-carrying line as live lines; in addition, when a ground line needs to be configured, the power line may also include a fifth current-carrying line as a ground line. The following is an example in which the power line includes the first current-carrying line L and the second current-carrying line N.

[0044] The leakage current detection line 200 covers the current-carrying line in the power line and is used to detect whether there is leakage current in the current-carrying line; it can be understood that the outside of the current-carrying line of the power line is covered with the leakage current detection line 200. When leakage occurs in the current-carrying line and is detected by the leakage current detection line 200, the switch module 100 can be controlled by the driving module 400 to disconnect the power connection between the input end and the output end of the power line, thereby realizing the detection and processing of the leakage situation.

[0045] The open circuit detection module 300 includes a first wire 310, a first resistor R1 and a first switch tube Q1. The first wire 310 is connected to the leakage current detection line 200 to form a detection loop. The first resistor R1 is connected in parallel to the detection loop. The first resistor R1 is also connected to the control pin of the first switch tube Q1 to control the first switch tube Q1 to be turned on when the detection loop is open. It can be understood that an open circuit detection module 300 is provided, wherein the first wire 310 is connected to the leakage current detection line 200 to form a detection loop, and the detection loop is connected in parallel to the first resistor R1, so that when the detection loop is not open, the first resistor R1 is short-circuited, and the current does not flow through the first resistor R1. When the detection loop is open, the current can only flow through the first resistor R1, so that the control pin state of the first switch tube Q1 connected to the first resistor R1 changes, causing the first switch tube Q1 to be turned on, and then the driving module 400 controls the switch module 100 to disconnect the power connection between the input end and the output end of the power line, thereby realizing the detection and processing of the disconnection of the detection loop.

[0046] The driving module 400 is connected to the switch module 100, the leakage current detection line 200 and the first switch tube Q1, and is used to control the switch module 100 to disconnect the power connection when the leakage current detection line 200 detects leakage current or the first switch tube Q1 is turned on. It should be noted that in addition to detecting the disconnection of the leakage current detection line 200, the disconnection of other positions in the detection loop can also be detected. The detection protection device for the power line provided in the embodiment of the present invention can effectively detect the leakage of the current-carrying line of the power line and the disconnection of the leakage current detection line 200 of the power line.

[0047] Reference Figure 1 In the detection and protection device provided in some embodiments of the present invention, the power line includes a first current-carrying line L and a second current-carrying line N; the driving module 400 includes a switch tripping driving unit 410, and the switch tripping driving unit 410 includes a second switch tube Q2 and a coil Lx for generating an electromagnetic force to drive the switch module 100, and 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 tripping 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.

[0048] It can be understood that when the leakage current detection line 200 detects that there is leakage current in the current-carrying line in the power line, the leakage current detection line 200 will generate a leakage current signal with a higher voltage level, which can trigger the second switch tube Q2 to turn on, thereby forming a tripping control loop, so that the coil Lx is energized to generate electromagnetic force, driving the switch module 100 to operate, and cutting off the power connection between the input end and the output end of the power line; similarly, when the detection circuit is open, the control pin state of the first switch tube Q1 changes, causing the first switch tube Q1 to turn on, and then the second switch tube Q2 can be triggered to turn on, thereby forming a tripping control loop, so that the coil Lx is energized to generate electromagnetic force, driving the switch module 100 to operate, and cutting off the power connection between the input end and the output end of the power line.

[0049] Reference Figure 1 In the detection protection device provided in some embodiments of the present invention, the driving module 400 also includes a switch tube driving unit 420, the switch tube driving unit 420 includes a second resistor R2 and a third resistor R3 connected in series, and the switch tripping driving unit 410 also includes a first diode D1 and a second diode D2; the leakage current detection line 200 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.

[0050] It can be understood that when leakage current occurs in the first current-carrying line L to the leakage current detection line 200, a current loop will be formed with the first current-carrying line L, the leakage current detection line 200, the second resistor R2, the third resistor R3, the second diode D2, the coil Lx, and the second current-carrying line N. As a result, under the voltage-dividing effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switch tube Q2 increases and triggers conduction, forming a tripping control loop with the second current-carrying line N, the coil Lx, the second switch tube Q2, the first diode D1, and the first current-carrying line L, so that the coil Lx is energized to generate electromagnetic force, driving the switch module 100 to operate, and cutting off the connection between the input end and the output end of the power line. Power connection; similarly, when leakage current appears in the second current-carrying line N to the leakage current detection line 200, a current loop will be formed with the flow direction being the second current-carrying line N, the leakage current detection line 200, the second resistor R2, the third resistor R3, the first diode D1, and the first current-carrying line L. As a result, under the voltage-dividing effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switch tube Q2 increases and triggers conduction, forming a tripping control loop with the flow direction being the second current-carrying line N, the coil Lx, the second switch tube Q2, the first diode D1, and the first current-carrying line L, so that the coil Lx is energized to generate electromagnetic force, driving the switch module 100 to operate, and cutting off the power connection between the input end and the output end of the power line.

[0051] Reference Figure 1 In the detection protection device provided in some embodiments of the present invention, the open circuit detection module 300 also includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the connection point between the first resistor R1 and the first wire 310, and the other end is connected to the connection point between the second switch tube Q2 and the coil Lx.

[0052] It can be understood that, when the fourth resistor R4 is set, when the detection loop is not disconnected, the detection loop is connected in parallel with the first resistor R1, thereby short-circuiting the first resistor R1, forming a current loop with a direction of the second current-carrying line N, the coil Lx, the fourth resistor R4, the detection loop, 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, the voltage of the control pin of the first switch tube Q1 can be low when the detection loop is not disconnected, which is not enough to turn on the first switch tube Q1; when the detection loop is disconnected, a current loop with a 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, the first current-carrying line L, under the voltage division effect of the first resistor R1 and the fourth resistor R4, the voltage of the control pin of the first switch tube Q1 increases and is triggered to be turned on; then a current loop is formed with the second current-carrying line N, the coil Lx, the first switch tube Q1, 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 switch tube Q2 increases and is triggered to be turned on, forming a tripping control loop with the second current-carrying line N, the coil Lx, the second switch tube Q2, the first diode D1, and the first current-carrying line L, so that the coil Lx is energized to generate electromagnetic force, driving the switch module 100 to operate, and cutting off the power connection between the input end and the output end of the power line.

[0053] Reference Figure 1 In the detection protection device provided in some embodiments of the present invention, the open circuit detection module 300 also includes a fifth resistor R5, one end of the fifth resistor R5 is connected to the connection point between the first resistor R1 and the leakage current detection line 200, and the other end is connected to the connection point between the third resistor R3 and the first diode D1.

[0054] It can be understood that the fifth resistor R5 is set, and the fifth resistor R5 is equivalent to being connected in parallel with the branch formed by the second resistor R2 and the third resistor R3, so that when the detection loop is disconnected, the second resistor R2 and the third resistor R3 can be replaced 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.

[0055] Reference Figure 1 In the detection protection device provided in some embodiments of the present invention, the open circuit detection module 300 further includes a sixth resistor R6, and the connection point between the first resistor R1 and the first wire 310 is connected to the control pin of the first switch tube Q1 through the sixth resistor R6.

[0056] It can be understood that setting the sixth resistor R6 as the input resistor of the control pin of the first switch tube Q1 can prevent the leakage current detection line 200 from generating a large voltage shock through the first wire 310 and causing damage to the first switch tube Q1 when detecting the leakage current of the current-carrying line. The sixth resistor R6 can play a better protective role for the first switch tube Q1.

[0057] Reference Figure 1 In the detection and protection device provided in some embodiments of the present invention, the switch tube driving unit 420 also includes a first capacitor C1 connected in parallel with the third resistor R3. In addition, it can be seen that the detection and protection device also includes a lightning protection unit 700, and the lightning protection unit 700 includes a first varistor ZR1 arranged between the first current-carrying line L and the second current-carrying line N; the switch tripping driving unit 410 also includes a second varistor ZR2 connected in parallel with the second switch tube Q2. It can be understood that a varistor is a resistor device with a nonlinear volt-ampere characteristic, which is mainly used to clamp the voltage when the circuit is subjected to overvoltage and absorb excess current to protect sensitive devices.

[0058] Reference Figure 1 In the detection protection device provided in some embodiments of the present invention, a test switch TEST is also included, one end of the test switch TEST is connected to the connection point between the first resistor R1 and the detection circuit, and the other end is connected to the connection point between the second switch tube Q2 and the coil Lx.

[0059] It can be understood that when the test switch TEST is pressed, a current loop is formed with the flow direction being the second current-carrying line N, the coil Lx, the test switch TEST, the first wire 310, the leakage current detection line 200, the second resistor R2, the third resistor R3, the first diode D1, and the first current-carrying line L, so that under the voltage-dividing action of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switch tube Q2 increases and triggers conduction, forming a tripping control loop with the flow direction being the second current-carrying line N, the coil Lx, the second switch tube Q2, the first diode D1, and the first current-carrying line L, so that the coil Lx is energized to generate electromagnetic force, driving the switch module 100 to operate, and cutting off the power connection between the input end and the output end of the power line.

[0060] Reference Figure 1In the detection and protection device provided in some embodiments of the present invention, an LED indicating unit 500 connected in parallel with the second switch tube Q2 is also included, and the LED indicating unit 500 includes a seventh resistor R7 and a light-emitting diode LED1 connected in series. It can also be seen that the LED indicating unit 500 also includes an eighth resistor R8, the connection point between the second switch 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.

[0061] It can be understood that when the first switch tube Q1 and the second switch tube Q2 are not turned on, that is, the detection circuit does not detect the leakage current and the detection circuit is not disconnected, a current loop is formed with 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 flowing thereto, and the light-emitting diode LED1 is powered on and lights up; when the second switch tube Q2 is actuated and turned on, it is equivalent to short-circuiting the LED indication unit 700, and the light-emitting diode LED1 is no longer lit, and when the second switch tube Q2 is turned on, it will control the switch module 100 to operate, cutting 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 no longer lights up.

[0062] In order to more clearly explain the detection and protection device for the power line of the present invention, Figure 1 A detailed embodiment of the present application is introduced in a comprehensive and detailed manner.

[0063] Reference Figure 1 The power line includes a first current-carrying line L as a live line and a second current-carrying line N as a neutral line; the detection protection device includes a switch module 100, a leakage current detection line 200, an open circuit detection module 300, a drive module 400 and a test switch TEST, wherein:

[0064] The switch module 100 is used to control the power connection between the input end and the output end of the power line;

[0065] The leakage current detection line 200 covers the current-carrying line in the power line and is used to detect whether there is leakage current in the current-carrying line;

[0066] The open circuit detection module 300 includes a first wire 310, a first resistor R1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first switch tube Q1;

[0067] The driving module 400 includes a switch tripping driving unit 410 and a switch tube driving unit 420; the switch tripping driving unit 410 includes a coil Lx for generating an electromagnetic force to drive the switch module 100, a second switch tube Q2, a first diode D1 and a second diode D2; the switch tube driving unit 420 includes a first capacitor C1, a second resistor R2 and a third resistor R3;

[0068] The connection relationship between the above components is as follows:

[0069] One end B of the leakage current detection line 200 close to the output end is connected to one end D of the first wire 310 close to the output end, forming a detection loop from one end A of the leakage current detection line 200 close to the input end to one end B of the leakage current detection line 200 close to the output end, then to one end D of the first wire 310 close to the output end, and finally to one end C of the first wire 310 close to the input end;

[0070] One end A of the leakage current detection line 200 close to the input end is respectively connected to one end of the first resistor R1, a switch pin of the first switch tube Q1, one end of the second resistor R2 and one end of the fifth resistor R5;

[0071] One end C of the first wire 310 close to the input end is respectively connected to the other end of the first resistor R1, one end of the fourth resistor R4, one end of the sixth resistor R6 and one end of the test switch TEST; the other end of the sixth resistor R6 is connected to the control pin of the first switch tube Q1;

[0072] The other end of the fifth resistor R5 is respectively connected to one end of the third resistor R3, one end of the first capacitor C1, a switch pin of the second switch tube Q2, the anode of the first diode D1 and the anode of the second diode D2; the cathode of the second diode D2 is connected to the first current-carrying line L;

[0073] The other end of the first capacitor C1, the other end of the second resistor R2 and the other end of the third resistor R3 are all connected to the control pin of the second switch tube Q2;

[0074] The other end of the test switch TEST, the other end of the fourth resistor R4, the other switch pin of the first switch tube Q1, the other switch pin of the second switch tube Q2, and the cathode of the second diode D2 are all connected to one end of the coil Lx; the other end of the coil Lx is connected to the second current-carrying line N.

[0075] In this embodiment, the situations that can trigger the switch module 100 to operate and cut off the power connection between the input end and the output end of the power line mainly include the following four situations:

[0076] 1. When leakage current occurs in the first current-carrying line L to the leakage current detection line 200, a current loop is formed with the first current-carrying line L, the leakage current detection line 200, the second resistor R2, the third resistor R3, the second diode D2, the coil Lx, and the second current-carrying line N. As a result, under the voltage-dividing effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switch tube Q2 increases and triggers conduction, forming a tripping control loop with the second current-carrying line N, the coil Lx, the second switch tube Q2, the first diode D1, and the first current-carrying line L, so that the coil Lx is energized to generate electromagnetic force, driving the switch module 100 to operate, and cutting off the power connection between the input end and the output end of the power line;

[0077] 2. When leakage current occurs in the second current-carrying line N to the leakage current detection line 200, a current loop will be formed with the flow direction of the second current-carrying line N, the leakage current detection line 200, the second resistor R2, the third resistor R3, the first diode D1, and the first current-carrying line L. As a result, under the voltage-dividing effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switch tube Q2 increases and triggers conduction, forming a tripping control loop with the flow direction of the second current-carrying line N, the coil Lx, the second switch tube Q2, the first diode D1, and the first current-carrying line L, so that the coil Lx is energized to generate electromagnetic force, driving the switch module 100 to operate, and cutting off the power connection between the input end and the output end of the power line;

[0078] 3. When any point in the detection loop is disconnected, a current loop is formed with the flow 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, so that under the voltage division of the fourth resistor R4, the voltage of the control pin of the first switch tube Q1 increases and triggers conduction; then a current loop is formed with the flow direction of the second current-carrying line N, the coil Lx, the first switch tube Q1, 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 of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switch tube Q2 increases and triggers conduction, forming a tripping control loop with the flow direction of the second current-carrying line N, the coil Lx, the second switch tube Q2, the first diode D1, and the first current-carrying line L, so that the coil Lx is energized to generate electromagnetic force, driving the switch module 100 to operate, and cutting off the power connection between the input end and the output end of the power line;

[0079] 4. When the test switch TEST is pressed, a current loop is formed, with the flow direction being the second current-carrying line N, the coil Lx, the test switch TEST, the first wire 310, the leakage current detection line 200, the second resistor R2, the third resistor R3, the first diode D1, and the first current-carrying line L. As a result, under the voltage-dividing effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switch tube Q2 increases and triggers conduction, forming a tripping control loop with the flow direction being the second current-carrying line N, the coil Lx, the second switch tube Q2, the first diode D1, and the first current-carrying line L, so that the coil Lx is energized to generate electromagnetic force, driving the switch module 100 to operate, and cutting off the power connection between the input end and the output end of the power line.

[0080] The power line detection and protection device provided in the embodiment of the present invention can effectively detect the leakage of the current-carrying wire of the power line and the disconnection of the leakage current detection wire of the power line; in addition, the power line detection and protection device provided in the embodiment of the present invention has a simple circuit structure, low cost and high safety.

[0081] In addition, refer to Figure 3 The second aspect embodiment of the present invention provides an electrical connection device 600, including a shell 610, a power cord 620 connected to the shell 610, and a detection and protection device as described above in the first aspect embodiment, wherein the switch module 100, the open circuit detection module 300 and the drive module 400 are arranged in the shell 610, and the leakage current detection line 200 and the first wire 310 are located in the power cord 620.

[0082] Reference Figure 4 , Figure 4 A schematic cross-sectional view of a power line 620 provided in one embodiment of the present invention. In the electrical connection device 600 provided in some embodiments of the present invention, the power line 620 includes a first current-carrying line L and a second current-carrying line N, and the leakage current detection line 200 includes a first shielding conductor 621 wrapping the first current-carrying line L and a second shielding conductor 622 wrapping the second current-carrying line N, and the first shielding conductor 621 and the second shielding conductor 622 are in contact with each other on the outside.

[0083] It is understandable that in Figure 4 In the illustrated embodiment, the leakage current detection line 200 is composed of a first shielding conductor 621 and a second shielding conductor 622 which are in contact with each other externally, that is, there are two shielding conductors for respectively detecting the leakage current of the first current-carrying line L and the second current-carrying line N. At this time, the disconnection condition of the leakage current detection line 200 refers to the condition where both the first shielding conductor 621 and the second shielding conductor 622 are disconnected.

[0084] Reference Figure 5In an electrical connection device 600 provided in another embodiment of the present invention, the leakage current detection line 200 includes, in addition to a first shielding conductor 621 that wraps the first current-carrying line L and a second shielding conductor 622 that wraps the second current-carrying line N, a third shielding conductor 623 that simultaneously wraps the first shielding conductor 621 and the second shielding conductor 622, and the third shielding conductor 623 is in contact with the first shielding conductor 621 and the second shielding conductor 622 at the same time.

[0085] It is understandable that in Figure 5 In the illustrated embodiment, the leakage current detection line 200 is composed of a first shielding conductor 621, a second shielding conductor 622 and a third shielding conductor 623 which are in contact with each other in pairs. At this time, the disconnection condition of the leakage current detection line 200 refers to the condition that the first shielding conductor 621, the second shielding conductor 622 and the third shielding conductor 623 are all disconnected.

[0086] Reference Figure 6 In an electrical connection device 600 provided in another embodiment of the present invention, the power line 620 includes a first current-carrying line L and a second current-carrying line N, and the leakage current detection line 200 includes a third shielding conductor 623 that simultaneously wraps the first current-carrying line L and the second current-carrying line N.

[0087] It is understandable that in Figure 6 In the illustrated embodiment, the leakage current detection line 200 is composed of a relatively large third shielding conductor 623 , and the leakage current detection line 200 is disconnected, and the third shielding conductor 623 is disconnected.

[0088] Reference Figure 4 , Figure 5 or Figure 6 In the electrical connection device 600 provided in some embodiments of the present invention, a first insulating layer 624 is provided between the first current-carrying line L and the first shielding conductor 621 , and a second insulating layer 625 is provided between the second current-carrying line N and the second shielding conductor 622 .

[0089] In addition, it can be seen that the power cord 620 also includes an outer insulating layer 626, which simultaneously wraps the first current-carrying wire L, the second current-carrying wire N, the leakage current detection wire 200 and the first conductive wire 310; a third current-carrying wire PE can also be arranged inside the outer insulating layer 626, and the third current-carrying wire PE and the first conductive wire 310 can both be provided with independent insulating layers.

[0090] It is understandable that the wrapping methods of the first shielding conductor 621, the second shielding conductor 622 and the third shielding conductor 623 include but are not limited to winding spirals, braided meshes, and hollow rings; the leakage current detection line 200 can be a metal, for example, it can include but are not limited to gold, silver, copper, iron, aluminum, alloys, etc.; the leakage current detection line 200 can also be a semiconductor material, for example, it can include but are not limited to carbon, silicon, germanium, graphene, etc.; the shape of the leakage current detection line 200 includes but is not limited to a mesh woven from multiple thin strips, two hollow circles or irregular shapes surrounded by thin sheets, and a hollow circle or irregular shape wound by a single strip, as long as these shapes can completely cover the first current-carrying line L and the second current-carrying line N. The cross-sectional shape of the power line 620 includes but is not limited to a circle, a square, an ellipse, a polygon, an irregular shape, etc.

[0091] In addition, a third aspect of the present invention provides an electrical device, including a load device and the electrical connection device 600 of the second aspect of the present invention, wherein the output end of the power line 620 is connected to the load device.

[0092] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A detection and protection device for a power line, characterized in that: include: A switch module, used to control the power connection between the input end and the output end of the power line; A leakage current detection line, covering the current-carrying line in the power line, and used to detect whether there is leakage current in the current-carrying line; An open circuit detection module, comprising a first wire, a first resistor and a first switch tube, wherein the first wire is connected to the leakage current detection line to form a detection loop, the first resistor is connected in parallel with the detection loop, and the first resistor is also connected to a control pin of the first switch tube to control the first switch tube to be turned on when an open circuit occurs in the detection loop; The driving module is connected to the switch module, the leakage current detection line and the first switch tube, and is used to control the switch module to disconnect the power connection when the leakage current detection line detects leakage current or the first switch tube is turned on.

2. The detection and protection device according to claim 1, characterized in that: The power line includes a first current-carrying line and a second current-carrying line; the driving module includes a switch tripping driving unit, the switch tripping driving unit includes a second switch tube and a coil for generating an electromagnetic force to drive the switch module, the second current-carrying line, the coil, the second switch tube, and the first current-carrying line are connected in sequence to form a tripping control loop when the second switch tube is turned on.

3. The detection and protection device according to claim 2, characterized in that: The driving module also includes a switch tube driving unit, which includes a second resistor and a third resistor connected in series, and the switch tripping driving unit also includes a first diode and a second diode; the leakage current detection line 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 switch tube, and the third resistor is connected to the first current-carrying line through the first diode and to the connection point between the second switch tube and the coil through the second diode.

4. The detection and protection device according to claim 3, characterized in that: The open circuit detection module further includes a fourth resistor, one end of which is connected to a connection point between the first resistor and the first wire, and the other end of which is connected to a connection point between the second switch tube and the coil.

5. The detection and protection device according to claim 3, characterized in that: The open circuit detection module further includes a fifth resistor, one end of which is connected to a connection point between the first resistor and the leakage current detection line, and the other end of which is connected to a connection point between the third resistor and the first diode.

6. The detection and protection device according to claim 3, characterized in that: The open circuit detection module further includes a sixth resistor, and a connection point between the first resistor and the first wire is connected to a control pin of the first switch tube through the sixth resistor.

7. The detection and protection device according to claim 3, characterized in that: The switch tube driving unit also includes a first capacitor connected in parallel with the third resistor.

8. The detection and protection device according to claim 2, characterized in that: It also includes a test switch, one end of which is connected to a connection point between the first resistor and the detection loop, and the other end of which is connected to a connection point between the second switch tube and the coil.

9. The detection and protection device according to claim 2, characterized in that: It also includes an LED indicating unit connected in parallel with the second switch tube, and the LED indicating unit includes a seventh resistor and a light emitting diode connected in series.

10. An electrical connection device, characterized in that: It comprises a shell, a power line connected to the shell, and the detection and protection device according to any one of claims 1 to 9, wherein the switch module, the open circuit detection module and the drive module are arranged in the shell, and the leakage current detection line and the first conductor are located in the power line.

11. The electrical connection device according to claim 10, characterized in that: The power line includes a first current-carrying line and a second current-carrying line, and the leakage current detection line includes a first shielding conductor wrapping the first current-carrying line and a second shielding conductor wrapping the second current-carrying line, and the first shielding conductor and the second shielding conductor are in contact with each other on the outside.

12. The electrical connection device according to claim 11, characterized in that: The leakage current detection line further includes a third shielding conductor that wraps the first shielding conductor and the second shielding conductor at the same time, and the third shielding conductor is in contact with the first shielding conductor and the second shielding conductor at the same time.

13. The electrical connection device according to claim 10, characterized in that: The power supply line includes a first current-carrying line and a second current-carrying line, and the leakage current detection line includes a third shielding conductor that wraps the first current-carrying line and the second current-carrying line at the same time.

14. The electrical connection device according to claim 11, characterized in that: A first insulating layer is disposed between the first current-carrying line and the first shielding conductor, and a second insulating layer is disposed between the second current-carrying line and the second shielding conductor.

15. An electrical equipment, characterized in that: The invention comprises a load device and the electrical connection device according to any one of claims 10 to 14, wherein the output end of the power line is connected to the load device.

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