CN216794606U

CN216794606U - Power line leakage detection protection device, electric connection equipment and electrical appliance

Info

Publication number: CN216794606U
Application number: CN202220368421.XU
Authority: CN
Inventors: 李成力; 陈龙
Original assignee: Suzhou Ele Mfg Co ltd
Current assignee: Suzhou Ele Mfg Co ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-06-21
Anticipated expiration: 2032-02-23

Abstract

The utility model provides a power line leakage detection protection device, an electric connection device and an electric appliance. The device comprises: the switch module controls the power connection between the input end and the output end of the power line; the leakage detection module comprises a first leakage detection line covering the first current-carrying line, a second leakage detection line covering the second current-carrying line, a first detection module and a second detection module, wherein the first leakage detection line is used for detecting a first leakage current signal on the first current-carrying line or generating a first self-detection fault signal when the first leakage detection line is broken; the driving module is coupled with the switch module and the electric leakage detection module, receives the first electric leakage current signal or the first self-detection fault signal and drives the switch module to disconnect the electric power connection; and receiving a second leakage current signal or a second self-checking fault signal and driving the switch module to disconnect the power connection. The device has the advantages of simple circuit structure, low cost and high safety.

Description

Power line leakage detection protection device, electric connection equipment and electrical appliance

Technical Field

The utility model relates to the field of electricity, in particular to a power line leakage detection protection device, electric connection equipment and an electric appliance.

Background

The power line leakage detection protector (LCDI device) is a safety protector for electric fire, and its main structure is power line with plug, and its main function is to detect leakage current between live wire and zero wire of power line between power supply plug and load electric appliance (for example air conditioner and dehumidifier) and wire protective layer (shield), and cut off power supply of electric appliance to prevent fire so as to provide safety protection. Therefore, the LCDI device can prevent an arc fault fire caused by power line damage and insulation strength reduction due to live wire (L wire), neutral wire (N wire), ground wire aging, abrasion, extrusion, or animal biting in the power line.

In the existing LCDI device, when the leakage detection line of the live wire or the zero wire in the power line does not have the protection function due to open circuit or broken circuit, the product can still supply power and output, so that the hidden danger of fire or other electricity utilization safety exists.

Therefore, a power line leakage detection protection device capable of detecting a leakage detection line is needed.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, a first aspect of the present invention provides a power line leakage detection protection device, including: a switch module configured to control a power connection between an input and an output of a power line; a leakage detection module including a first leakage detection line that wraps a first current-carrying line in the power supply line and is configured to detect a first leakage current signal on the first current-carrying line or to generate a first self-detection fault signal when the first leakage detection line is open-circuited, and a second leakage detection line that wraps a second current-carrying line in the power supply line and is configured to detect a second leakage current signal on the second current-carrying line or to generate a second self-detection fault signal when the second leakage detection line is open-circuited; and a driving module coupled with the switching module and the leakage detection module and configured to: receiving the first leakage current signal or the first self-test fault signal and driving the switch module to disconnect the power connection in response to the first leakage current signal or the first self-test fault signal; and/or receive the second leakage current signal or the second self-test fault signal and drive the switch module to disconnect the power connection in response to the second leakage current signal or the second self-test fault signal.

In some embodiments, the power line leakage detection protection device further comprises: a self-test module coupled to the leakage detection module, the driving module, the first current-carrying line, and the second current-carrying line, and configured to detect whether at least one of the first leakage detection line and the second leakage detection line is open-circuited, and generate the first self-test fault signal in cooperation with the first leakage detection line when the first leakage detection line is open-circuited, and generate the second self-test fault signal in cooperation with the second leakage detection line when the second leakage detection line is open-circuited.

In some embodiments, the drive module comprises: a coil generating an electromagnetic force for driving the switching module; and at least one semiconductor element coupled in series to the coil that causes the coil to generate the electromagnetic force under the influence of one or more of the first leakage current signal, the second leakage current signal, the first self-test fault signal, and the second self-test fault signal.

In some embodiments, the semiconductor element is selected from one of: silicon controlled, bipolar transistor, field effect transistor and photoelectric coupling element.

In some embodiments, the power line leakage detection protection device further comprises: at least one test module comprising a test switch coupled to the leakage detection module, the driver module further configured to: when the test switch is closed and the electric leakage detection module works normally, the switch module is driven to disconnect the electric power connection.

In some embodiments, one end of the test switch is coupled to one end of the first leakage detection line and one end of the second leakage detection line, the other end of the test switch is coupled to the first current carrying line or the second current carrying line, and the other end of the first leakage detection line and the other end of the second leakage detection line are respectively coupled to the driving module.

In some embodiments, the test modules are two, wherein one test switch has one end coupled to one end of the first leakage detection line and the other end coupled to the first current-carrying line, the other end of the first leakage detection line is coupled to the driving module, the other test switch has one end coupled to one end of the second leakage detection line and the other end coupled to the second current-carrying line, and the other end of the second leakage detection line is coupled to the driving module.

A second aspect of the present invention provides an electrical connection apparatus comprising: a housing; and a power supply line leakage detection protection device according to any one of the embodiments of the first aspect, the power supply line leakage detection protection device being housed in the housing.

A third aspect of the present invention provides an electrical consumer, the electrical consumer comprising: a load device; and an electrical connection device coupled between a power supply line and the load device for supplying power to the load device, wherein the electrical connection device comprises the power line leakage detection protection apparatus according to any one of the embodiments of the first aspect.

In the utility model, the two leakage detection lines are respectively arranged to cover one current-carrying wire and form a leakage detection loop with the driving module, so that the leakage condition on the two current-carrying wires or the open circuit condition of the two leakage detection lines can be independently detected. In addition, the power line leakage detection protection device provided by the utility model has the advantages of simple circuit structure, low cost and high safety.

Drawings

Embodiments are shown and described with reference to the drawings. These drawings are provided to illustrate the basic principles and thus only show the aspects necessary for understanding the basic principles. The figures are not to scale. In the drawings, like reference numerals designate similar features. In addition, lines drawn between each block in the architecture diagram indicate that there is electrical coupling between the two blocks, and the absence of a line drawn between the two blocks does not indicate that the two blocks are not coupled.

Fig. 1 shows an architecture diagram of a power line leakage detection protection device according to an embodiment of the present invention;

fig. 2 shows a schematic diagram of a first embodiment of a power line leakage detection protection device according to the present invention;

fig. 3 shows a schematic diagram of a second embodiment of a power line leakage detection protection device according to the present invention;

fig. 4 shows a schematic diagram of a third embodiment of a power line leakage detection protection arrangement according to the present invention;

fig. 5 shows a schematic diagram of a fourth embodiment of a power line leakage detection protection device according to the present invention;

fig. 6 shows a schematic diagram of a fifth embodiment of a power line leakage detection protection device according to the present invention;

fig. 7 shows a schematic diagram of a sixth embodiment of a power line leakage detection protection device according to the present invention;

fig. 8 shows a schematic diagram of a seventh embodiment of a power line leakage detection protection device according to the present invention;

FIG. 9A illustrates a cross-sectional view of one embodiment of a power cord according to the present invention;

FIG. 9B illustrates a cross-sectional view of another embodiment of a power cord according to the present invention;

FIG. 9C illustrates a cross-sectional view of yet another embodiment of a power cord according to the present invention; and

figure 9D shows a cross-sectional view of yet another embodiment of a power cord according to the present invention;

Detailed Description

In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the utility model may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the utility model. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

Before describing embodiments of the present invention, some terms referred to in the present invention are first explained to better understand the present invention.

As used herein, the terms "connected," "coupled," or "coupled," and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "a," "an," "a," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one.

As used herein, the terms "comprising," "including," and the like are to be construed as open-ended terms, i.e., "including/including but not limited to," meaning that additional content may be included. The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment," and the like. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The utility model aims to provide a power line leakage detection protection device. In the device, two leakage detection lines are respectively arranged to cover one current-carrying line and form a leakage detection loop with the driving module. Therefore, the device can independently detect the leakage of the two current-carrying wires and the disconnection of the two leakage detection wires.

Fig. 1 shows an architecture diagram of a power line leakage detection protection device according to an embodiment of the present invention. As shown in fig. 1, the power line leakage detection protection device 100 includes a switch module 103, a leakage detection module 104, and a driving module 105. The switch module 103 controls the power connection between the input 101 and the output 102 of the power line. The leakage detection module 104 includes a first leakage detection line and a second leakage detection line. The first leakage detection line covers a first current-carrying line in the power line and detects a first leakage current signal on the first current-carrying line or generates a first self-detection fault signal when the first leakage detection line is broken, and the second leakage detection line covers a second current-carrying line in the power line and detects a second leakage current signal on the second current-carrying line or generates a second self-detection fault signal when the second leakage detection line is broken. The driving module 105 is coupled to the switching module 103 and the leakage detecting module 104, receives the first leakage current signal or the first self-checking fault signal and drives the switching module 103 to disconnect the power connection in response to the first leakage current signal or the first self-checking fault signal, and the driving module 105 further receives the second leakage current signal or the second self-checking fault signal and drives the switching module 103 to disconnect the power connection in response to the second leakage current signal or the second self-checking fault signal. That is, the first leakage current signal, the first self-checking fault signal, the second leakage current signal, and the second self-checking fault signal may trigger the driving module 105 to drive the switching module 103 to disconnect the power connection. When the first leakage detection line detects the first leakage current signal or generates the first self-detection fault signal and/or the second leakage detection line detects the second leakage current signal or generates the second self-detection fault signal, the detected or generated signal is provided to the driving module 105, and under the action of the signal, the driving module 105 drives the switch module 103 to disconnect the power. In the power line leakage detection protection device 100, two leakage detection lines respectively cover one current-carrying line and form a leakage detection loop with the driving module. Therefore, the device 100 can detect the leakage of the two current-carrying lines or the disconnection of the two leakage detection lines independently.

In some embodiments, the power line leakage detection protection device 100 further comprises a self-test module (not shown in fig. 1). The self-checking module is coupled with the electric leakage detection module 104, the driving module 105, the first current-carrying wire and the second current-carrying wire, detects whether at least one of the first electric leakage detection wire and the second electric leakage detection wire is broken, generates a first self-checking fault signal by matching with the first electric leakage detection wire when the first electric leakage detection wire is broken, and generates a second self-checking fault signal by matching with the second electric leakage detection wire when the second electric leakage detection wire is broken. By providing the self-test module, it is possible to detect whether the first leakage detection line and the second leakage detection line are faulty (e.g., open circuit or open circuit) and disconnect the power connection when a fault occurs, thereby improving the reliability of the power supply line leakage detection protection device 100.

In some embodiments, the drive module 105 includes a coil and at least one semiconductor element. The coil generates an electromagnetic force for driving the switching module 103, and the semiconductor element is coupled in series to the coil, which causes the coil to generate an electromagnetic force under the action of one or more of the first leakage current signal, the second leakage current signal, the first self-test fault signal, and the second self-test fault signal. The semiconductor element may be a thyristor, a bipolar transistor, a field effect transistor, or a photocoupler.

In some embodiments, the power line leakage detection protection device 100 further comprises at least one test module (not shown in fig. 1). The test module includes a test switch coupled to the leakage detection module 104. When the test switch is closed and the leakage detection module 104 works normally, the driving module 105 drives the switch module 103 to disconnect the power connection, and when the test switch is closed and the leakage detection module 104 fails, the switch module 103 maintains the power connection. By providing the test module, a user can manually detect whether the leakage detection module 104 (e.g., the first leakage detection line and the second leakage detection line) has a fault (e.g., an open circuit or an open circuit), and when the fault occurs, the user is prompted by maintaining the power connection, so as to improve the reliability of the power line leakage detection protection apparatus 100.

Fig. 2 shows a schematic diagram of a first embodiment of a power line leakage detection protection device according to the present invention. As shown in fig. 2, the power line leakage detection protection device includes a switch module 103, a leakage detection module 104, a driving module 105, a self-test module 106, and two test modules 107 and 107'. As shown in fig. 2, the switch module 103 includes a RESET switch RESET for controlling the power connection between the input terminal LINE and the output terminal LOAD of the power supply LINE. The power line comprises a first current-carrying line 11 (live line), a second current-carrying line 12 (neutral line) and a third current-carrying line 13 (ground line). The leakage detecting module 104 includes a first leakage detecting line 141, a second leakage detecting line 142, and a connection line 21. The first leakage detection line 141 covers the first current-carrying line 11, and the second leakage detection line 142 covers the second current-carrying line 12. In this embodiment, the first end of each of the first leakage detecting line 141, the second leakage detecting line 142, and the connection line 21 is an end distant from the LOAD, and is located on the left side in fig. 2; the second end is the end near the LOAD, on the right in fig. 2.

As shown in fig. 2, the second ends of the first and second

leakage detecting lines

141 and 142 are connected to the second end of the connection line 21. A first end of the first leakage detection line 141 is connected to one end of the resistor R5 of the self-TEST module 106 to form a connection point a, and the other end of the resistor R5 is connected to one end of the first current-carrying line 11, the RESET switch RESET, and the TEST switch TEST of the TEST module 107. A first end of the second leakage detecting line 142 is connected to one end of the resistor R51 of the self-TEST module 106 to form a connection point B, and the other end of the resistor R51 is connected to one end of the second current-carrying line 12, the RESET switch RESET, and the TEST switch TEST of the TEST module 107. A first end of the connection line 21 is connected to one end of the resistor R3 of the TEST module 107, one end of the resistor R31 of the TEST module 107', and one end of the resistor R6, and the other ends of the resistors R3 and R31 are respectively connected to the other end of the TEST switch TEST. In the driving module 105, the anode of the diode D3 is connected to the connection point a, the cathode is connected to one end of the resistor R2, the anode of the diode D31 is connected to the connection point B, the cathode is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the control electrode of the thyristor SCR 1. Two ends of the capacitor C1 are respectively connected to the control electrode and the cathode of the thyristor SCR 1. The cathode of thyristor SCR1 is also connected to the anodes of diodes D1 and D2, the anode of which is connected to the cathode of diode D1 and one end of solenoid SOL. The other end of the solenoid SOL is connected to the second current carrying line 12 and the RESET switch RESET. The cathode of diode D2 is connected to first current carrying line 11 and RESET switch RESET.

When the first leakage detecting line 141, the second leakage detecting line 142 and the connecting line 21 are all normally operated (not opened or disconnected), the current of the first current carrying line 11 flows through the first loop from the R5-the first leakage detecting line 141-the connecting line 21-R6-D1-SOL to the second current carrying line 12 and the second loop from the R5-the first leakage detecting line 141-the second leakage detecting line 142-R51 to the second current carrying line 12. The resistance value of the resistor R51 is set to be much larger than that of the resistor R6, and current mainly flows in the first loop. By setting the resistances of resistors R5 and R6, point a is limited to a lower potential, which is insufficient to trigger SCR1 through resistor R2. Similarly, the current of the second current carrying line 12 flows through the first loop of R51-the second leakage detecting line 142-the connecting line 21-R6-D2 to the first current carrying line 11 and the second loop of R51-the second leakage detecting line 142-the first leakage detecting line 141-R5 to the first current carrying line 11. The resistance of the resistor R5 is set to be much larger than that of the resistor R6, and current mainly flows in the first loop. By setting the resistance values of the resistors R51 and R6, point B is limited to a lower potential, which is not enough to trigger the SCR1 through R2. At this time, the switch module 103 is in a closed state, and the product is normally powered on for use.

When the first current-carrying LINE 11 generates a leakage current signal (first leakage current signal), the potential at the point a rises, the thyristor SCR1 is triggered to conduct through the first current-carrying LINE 11-the first detection LINE 141-D3-R2, a large current is generated on the solenoid SOL, a sufficient magnetic field is formed, the RESET switch RESET of the driving switch module 103 is tripped, and the power connection between the input terminal LINE and the output terminal LOAD is cut off. Similarly, when the second current-carrying LINE 12 generates a leakage current signal (second leakage current signal), the potential at point B rises, and the thyristor SCR1 is triggered to conduct through the second current-carrying LINE 12-the second detection LINE 142-D31-R2, so that a larger current is generated on the solenoid SOL, a sufficiently large magnetic field is formed, the RESET switch RESET of the driving switch module 103 is tripped, and the power connection between the input terminal LINE and the output terminal LOAD is cut off. Thus, the device can independently detect leakage current signals on the first current-carrying line 12 and the second current-carrying line 12.

When the first detection LINE 141 is opened or broken, the resistor R6 loses the voltage dividing function, the potential at the point a rises, a current (a first self-detection fault signal) is generated through the first current-carrying LINE 11-R5-D3-R2, the thyristor SCR1 is triggered to be turned on, the RESET switch RESET of the solenoid SOL-driven switch module 103 is tripped, and the power connection between the input end LINE and the output end LOAD is further cut off. When the second detection LINE 142 is opened or disconnected, the resistor R6 also loses the voltage dividing function, the potential at the point B rises, and a current (a second self-detection fault signal) is generated through the second current-carrying LINE 12-R51-D31-R2, so that the thyristor SCR1 is triggered to be turned on, the RESET switch RESET of the solenoid SOL-driven switch module 103 is tripped, and the power connection between the input terminal LINE and the output terminal LOAD is further cut off. Accordingly, the apparatus can independently detect whether the first and

second sensing lines

141 and 142 are malfunctioning.

In addition to the self-test module 106, the fault test of the leakage detection module 104 may also be performed by the test modules 107 and 107'. In this embodiment, for the TEST module 107, the first current carrying line 11-TEST-R3-connection line 21-first leakage detection line 141-D3-R2-SCR 1-D1-SOL-second current carrying line 12, the first current carrying line 11-TEST-R3-connection line 21-second leakage detection line 142-D31-R2-SCR 1-D1-SOL-second current carrying line 12 form two TEST paths. For the TEST module 107', the second current carrying line 12-TEST-R31-connection line 21-first current leakage detection line 141-D3-R2-SCR 1-D2-first current carrying line 11, and the second current carrying line 12-TEST-R31-connection line 21-second current leakage detection line 142-D31-R2-SCR 1-D2-first current carrying line 11 form two TEST paths.

When the first leakage detection line 141, the second leakage detection line 142 and the connection line 21 all work normally, and no leakage occurs between the first leakage detection line 141 and the first current-carrying line 11, and between the second leakage detection line 142 and the second current-carrying line 12, the SCR1 cannot be triggered, and the product works normally.

When one or both of the two TEST switches TEST is pressed, current flows in the TEST path, triggering the silicon controlled rectifier SCR1 to conduct, and the solenoid SOL drives the RESET switch RESET to trip, thereby cutting off the power connection. If any one of the first, second and

connection lines

141, 142 and 21 is opened or broken, the TEST path cannot form a closed loop when either or both of the two TEST switches TEST are pressed, and thus the thyristor SCR1 cannot be triggered, causing the RESET switch RESET to disconnect the power connection between the input and output of the power supply line. At this time, the user is prompted that there may be an open or disconnected situation in at least one of the first leakage detecting line 141, the second leakage detecting line 142, and the connection line 21. Accordingly, the user can detect whether the first leakage detecting line 141, the second leakage detecting line 142, and the connection line 21 are intact by operating either or both of the two TEST switches TEST. It is understood that only one test module 107 or 107' may be provided since one test module can detect the first leakage detecting line 141, the second leakage detecting line 142, and the connection line 21. Furthermore, in addition to detecting the failure of the leakage detection module 104, the test modules 107 and 107' may also be used to detect whether other components in the test path have failed.

Fig. 3 shows a schematic diagram of a second embodiment of a power line leakage detection protection device according to the present invention. Compared to the embodiment of fig. 2, the difference is mainly in the leakage detecting module 104 and the driving module 105. In the embodiment of fig. 3, the leakage detecting module 104 includes a first leakage detecting line 141, a second leakage detecting line 142, and

connection lines

21 and 22. The first leakage detection line 141 covers the first current-carrying line 11, and the second leakage detection line 142 covers the second current-carrying line 12. As in the embodiment of fig. 2, in this embodiment, the first end of each of the first leakage detecting line 141, the second leakage detecting line 142, and the connection lines 21 and 22 is an end distant from the LOAD, and is located on the left side in fig. 3; the second end is the end near the LOAD, which is located on the right side in fig. 3.

A second end of the first leakage detecting line 141 is connected to a second end of the connection line 21, and a second end of the second leakage detecting line 142 is connected to a second end of the connection line 22. A first terminal of the first leakage detection line 141 is connected to one terminal of the resistor R5 of the self-test module 106, forming a connection point a. A first end of the second leakage detection line 142 is connected to one end of the resistor R51 of the self-test module 106, forming a connection point B. The first end of the connection line 21 is connected between the resistors R3 and R6, and the first end of the connection line 22 is connected between the resistors R31 and R61. In the driving module 105, one end of a resistor R2 is connected to a point a, the other end is connected to the control electrode of a thyristor SCR1, one end of a resistor R21 is connected to a point B, and the other end is connected to the control electrode of a thyristor SCR 11. Two ends of the capacitor C1 are respectively connected to the control electrode and the cathode of the thyristor SCR1, and two ends of the capacitor C11 are respectively connected to the control electrode and the cathode of the thyristor SCR 11.

When the first leakage detecting line 141, the second leakage detecting line 142 and the connecting

lines

21 and 22 are all normally operated (not opened or broken), the current of the first current-carrying line 11 flows through the loop of R5-the first leakage detecting line 141-the connecting line 21-R6-D1-SOL to the second current-carrying line 12. By setting the resistances of resistors R5 and R6, point a is limited to a lower potential, which is insufficient to trigger SCR1 through resistor R2. Similarly, the current of the second current-carrying line 12 flows through the loop of R51-the second leakage detection line 142-the connection line 22-R61-D2 to the first current-carrying line 11. By setting the resistance values of the resistors R51 and R61, point B is limited to a lower potential, which is not enough to trigger the SCR11 through R21. At this time, the switch module 103 is in a closed state, and the product is normally powered on for use.

When the first current-carrying LINE 11 generates a leakage current signal (first leakage current signal), the potential at the point a rises, and the thyristor SCR1 is triggered to conduct through the first current-carrying LINE 11-the first detection LINE 141-R2, so that a large current is generated on the solenoid SOL, a sufficiently large magnetic field is formed, the RESET switch RESET of the driving switch module 103 is tripped, and the power connection between the input terminal LINE and the output terminal LOAD is cut off. Similarly, when the second current carrying LINE 12 generates a leakage current signal (second leakage current signal), the potential at point B rises, triggering the SCR11 to conduct through the second current carrying LINE 12-the second detection LINE 142-R21, and a large current is generated on the solenoid SOL, so that a magnetic field is formed large enough to trip the RESET switch RESET of the driving switch module 103, and further to cut off the power connection between the input LINE and the output LOAD. Thus, the device can independently detect leakage current signals on the first current-carrying line 12 and the second current-carrying line 12.

When the first detection LINE 141 is opened or broken, the resistor R6 loses the voltage dividing function, the potential at the point a rises, a current (a first self-detection fault signal) is generated through the first current-carrying LINE 11-R5-R2, the silicon controlled rectifier SCR1 is triggered to be turned on, the RESET switch RESET of the solenoid SOL driving switch module 103 is tripped, and then the power connection between the input end LINE and the output end LOAD is cut off. When the second detection LINE 142 is opened or disconnected, the resistor R61 also loses the voltage dividing function, the potential at the point B rises, and a current (a second self-detection fault signal) is generated through the second current-carrying LINE 12-R51-R21 to trigger the silicon controlled rectifier SCR11 to be turned on, and the solenoid SOL drives the RESET switch RESET of the switch module 103 to trip, so that the power connection between the input end LINE and the output end LOAD is cut off. Accordingly, the apparatus can independently detect whether the first and

second sensing lines

141 and 142 are malfunctioning.

In addition to the self-test module 106, the fault test of the leakage detection module 104 may also be performed by the test modules 107 and 107'. In this embodiment, for the TEST module 107, the first current carrying line 11-TEST-R3-connection line 21-first leakage detection line 141-R2-SCR 1-D1-SOL-second current carrying line 12 form a TEST path. For TEST module 107', second current carrying line 12-TEST-R31-connection line 22-second leakage detection line 142-R21-SCR 11-D2-first current carrying line 11 form a TEST path.

When the first leakage detection line 141, the second leakage detection line 142 and the connection lines 21 and 22 all work normally, and no leakage occurs between the first leakage detection line 141 and the first current-carrying line 11 and between the second leakage detection line 142 and the second current-carrying line 12, the thyristors SCR1 and SCR11 cannot be triggered, and the product works normally.

When the TEST switch TEST of the TEST module 107 is pressed, that is, the TEST path of the first current-carrying line 11-TEST-R3-the connection line 21-the first leakage detection line 141-R2-SCR 1-D1-SOL-the second current-carrying line 12 is a closed loop, current flows in the TEST path, the silicon controlled rectifier SCR1 is triggered to be conducted, and the solenoid SOL drives the RESET switch RESET to be tripped, so that the power connection is cut off. If any of the first leakage detection line 141 and the connection line 21 is opened or broken, the TEST switch TEST of the TEST module 107 is pressed, and the TEST path cannot form a closed loop, so that the SCR1 cannot be triggered, and the RESET switch RESET disconnects the power connection between the input and the output of the power line. At this time, the user is prompted that there may be an open or a broken condition in at least one of the first leakage detecting line 141 and the connection line 21. Accordingly, the user can detect whether the first leakage detecting line 141 and the connection line 21 are intact by operating the TEST switch TEST of the TEST module 107.

Similarly, when the TEST switch TEST of the TEST module 107' is pressed, that is, the TEST path of the second current-carrying line 12-TEST-R31-the connection line 22-the second leakage detection line 142-R21-SCR 11-D2-the first current-carrying line 11 is a closed loop, and current flows in the TEST path, the thyristor SCR11 is triggered to be turned on, and the solenoid SOL drives the RESET switch RESET to trip, so that the power connection is cut off. If any of the second leakage detection line 142 and the connection line 22 is opened or broken, the TEST switch TEST of the TEST module 107' is pressed, and the TEST path cannot form a closed loop, so that the SCR11 cannot be triggered, and the RESET switch RESET disconnects the power connection between the input and the output of the power line. At this time, the user is prompted that there may be an open or disconnected situation in at least one of the second leakage detecting line 142 and the connection line 22. Accordingly, the user can detect whether the second leakage detecting line 142 and the connection line 22 are intact by operating the TEST switch TEST of the TEST module 107'. Furthermore, in addition to detecting a failure of the leakage detecting module 104, the testing modules 107 and 107' may also be used to detect whether other elements in the testing path have failed.

Fig. 4 shows a schematic diagram of a third embodiment of a power line leakage detection protection device according to the present invention. The difference between the embodiment of fig. 4 and the embodiment of fig. 2 is mainly the wiring manner of the lines in the leakage detection module 104. More specifically, the leakage detecting module 104 includes a first leakage detecting line 141, a second leakage detecting line 142, and

connection lines

21 and 22. First ends of the first and second

leakage detecting lines

141 and 142 are each connected to one end of the resistors R3, R31, and R6. A second terminal of the first leakage detection line 141 is connected to one terminal of the resistor R5 via a connection line 21, and a second terminal of the second leakage detection line 142 is connected to one terminal of the resistor R51 via a connection line 22. The leakage detection process of the leakage detection module 104 on the first current-carrying line 11 and the second current-carrying line 12 and the fault detection process of the leakage detection module 104 on the self-detection module 106 and the test modules 107 and 107' are the same as those in the embodiment of fig. 2, and will not be described again here.

Fig. 5 shows a schematic diagram of a fourth embodiment of a power line leakage detection protection device according to the present invention. The difference between the embodiment of fig. 5 and the embodiment of fig. 3 is mainly the wiring manner of the lines in the leakage detection module 104. More specifically, the first end of the first leakage detection line 141 is connected between the resistors R3 and R6, and the second end is connected between the resistors R5 and R2 via the connection line 21. The second leakage detection line 142 has a first end connected between the resistors R31 and R61, and a second end connected between the resistors R51 and R21. The process of detecting leakage of the first current-carrying line 11 and the second current-carrying line 12 by the leakage detecting module 104 and the process of detecting faults of the leakage detecting module 104 by the self-detecting module 106 and the testing modules 107 and 107' are the same as those of the embodiment of fig. 3, and will not be described again here.

Fig. 6 shows a schematic diagram of a fifth embodiment of the power line leakage detection protection device according to the present invention. The embodiment of fig. 6 differs from the embodiment of fig. 3 mainly in the drive module 105. In the embodiment of fig. 6, the drive module 105 employs a similar structure to the embodiment of fig. 2, i.e., a thyristor SCR1 is used to drive the solenoid SOL. More specifically, the anode of the diode D3 is connected to a connection point a between the resistor R5 and the first end of the first drain detection line 141. An anode of the diode D31 is connected to a connection point B between the resistor R51 and the first end of the second leakage detecting line 142. The cathodes of diodes D3 and D31 are both connected to one end of resistor R2, and the other end of resistor R2 is connected to the control electrode of thyristor SCR 1. The leakage detection process of the leakage detection module 104 on the first current-carrying line 11 and the second current-carrying line 12 and the fault detection process of the leakage detection module 104 by the self-detection module 106 and the test modules 107 and 107' are similar to the embodiments of fig. 2 and fig. 3, and will not be described again here.

Fig. 7 shows a schematic diagram of a sixth embodiment of a power line leakage detection protection device according to the present invention. The embodiment of fig. 7 differs from the embodiment of fig. 2 mainly in the drive module 105. In the embodiment of fig. 7, the drive module 105 employs a similar structure to the embodiment of fig. 3, i.e., two thyristors SCR1 and SCR11 are used to drive the solenoid SOL. More specifically, one end of the resistor R2 is connected to a connection point a between the resistor R5 and the first end of the first leakage detection line 141, and the other end is connected to a control electrode of the thyristor SCR 1. One end of the resistor R21 is connected to a connection point B between the resistor R51 and the first end of the second leakage detection line 142, and the other end is connected to the control electrode of the thyristor SCR 11. The leakage detection process of the leakage detection module 104 on the first current-carrying line 11 and the second current-carrying line 12 and the fault detection process of the leakage detection module 104 by the self-detection module 106 and the test modules 107 and 107' are similar to the embodiments of fig. 2 and fig. 3, and will not be described again here.

Fig. 8 shows a schematic diagram of a seventh embodiment of a power line leakage detection protection device according to the present invention. The difference between the embodiment of fig. 8 and the embodiment of fig. 2 is mainly the wiring of the self-test module 106. More specifically, one end of the resistor R5 is connected to the anode of the diode D3 and the first end of the first leakage detecting module 141, forming a connection point a, and the other end is connected to the second current-carrying line 12. One end of the resistor R51 is connected to the anode of the diode D31 and the first end of the second leakage detecting module 142 to form the connection point B, and the other end is connected to the first current-carrying line 11.

When the first leakage detecting line 141, the second leakage detecting line 142 and the connecting line 21 are all normally operated (not opened or disconnected), the current of the second current carrying line 12 flows through R5-the first leakage detecting line 141-the connecting line 21-R6-D2 to the first loop of the first current carrying line 11 and R5-the first leakage detecting line 141-the second leakage detecting line 142-R51 to the second loop of the first current carrying line 11. The resistance value of the resistor R51 is set to be much larger than that of the resistor R6, and current mainly flows in the first loop. By setting the resistances of resistors R5 and R6, point a is limited to a lower potential, which is insufficient to trigger SCR1 through resistor R2. Similarly, the current of the first current carrying line 11 flows through the first loop from R51-the second leakage detecting line 142-the connection line 21-R6-D1-SOL to the second current carrying line 12 and the second loop from R51-the second leakage detecting line 142-the first leakage detecting line 141-R5 to the second current carrying line 12. The resistance of the resistor R5 is set to be much larger than that of the resistor R6, and current mainly flows in the first loop. By setting the resistances of resistors R51 and R6, point B is limited to a lower potential, insufficient to trigger SCR1 via R2. At this time, the switch module 103 is in a closed state, and the product is normally powered on for use.

When the first detection LINE 141 is opened or disconnected, the resistor R6 loses the voltage dividing function, the potential at the point a rises, a current (a first self-detection fault signal) is generated through the first current-carrying LINE 12-R5-D3-R2, the thyristor SCR1 is triggered to be turned on, the RESET switch RESET of the solenoid SOL-driven switch module 103 is tripped, and the power connection between the input end LINE and the output end LOAD is further cut off. When the second detection LINE 142 is open or disconnected, the resistor R6 also loses the voltage dividing function, the potential at the point B rises, and a current (a second self-checking fault signal) is generated through the first current-carrying LINE 11-R51-D31-R2, so that the thyristor SCR1 is triggered to be conducted, the RESET switch RESET of the solenoid SOL-driven switch module 103 is tripped, and the power connection between the input terminal LINE and the output terminal LOAD is further cut off. Accordingly, the apparatus can independently detect whether the first and

second sensing lines

141 and 142 are malfunctioning.

In the above embodiment, the two leakage detection lines are respectively arranged to cover one current-carrying line and form a leakage detection loop with the driving module, so that the leakage condition on the two current-carrying lines and the open circuit condition of the two leakage detection lines can be separately detected. In addition, the power line leakage detection protection device provided by the utility model has the advantages of simple circuit structure, low cost and high safety.

Figure 9A shows a cross-sectional view of one embodiment of a power cord according to the present invention. Figure 9B shows a cross-sectional view of another embodiment of a power cord according to the present invention. Figure 9C shows a cross-sectional view of yet another embodiment of a power cord according to the present invention. Figure 9D shows a cross-sectional view of yet another embodiment of a power cord according to the present invention.

As shown in fig. 9A, the power supply line 1 includes a first current-carrying line (e.g., the live line L)11, a second current-carrying line (e.g., the neutral line N)12, a third current-carrying line (e.g., the ground line G)13, a first leakage detection line 141, a second leakage detection line 142, and

connection lines

21 and 22. The power supply line 1 of fig. 9A can be used in the power supply line leakage detection protection device of fig. 3-6. The first leakage detection line 141 is coated outside the insulation layer of the first current-carrying line 11, and the second leakage detection line 142 is coated outside the insulation layer of the second current-carrying line 12. As shown in fig. 9A, the power supply line 2 may further include a wire filler (or a filler). In fig. 9A, the first leakage detection line 141 is covered with an insulating layer 15, and the second leakage detection line 142 is not covered with an insulating layer. In some embodiments, the outer surfaces of the first and second

leakage detecting lines

141 and 142 may be coated with insulating layers, respectively, or the outer surface of the first leakage detecting line 141 may be not coated with an insulating layer and the outer surface of the second leakage detecting line 142 may be coated with an insulating layer. The first and second

leakage detecting lines

141 and 142 may be a metal (e.g., copper, aluminum, etc.) braided structure, a wound structure formed by at least one metal wire, a metal foil-clad structure, or a combination of any of the structures. The insulating layer can be integrally formed by plastic materials, and can also be formed by coating materials which accord with the electrical insulating property, such as insulating paper, cotton and the like.

Fig. 9B is different from fig. 9A in that the power supply line 1 includes only the connection line 21, and the outside of the first leakage detecting line 141 is covered with a first insulating layer 151, and the outside of the second leakage detecting line 142 is covered with a second insulating layer 152. The power supply line 1 of fig. 9B can be used for the power supply line leakage detection protection device in fig. 2, 7-8. Similar to fig. 9A, in fig. 9B, the connection line 21 may be arranged at any suitable position. In some embodiments, an insulating layer may be coated outside one of the first and second leakage detecting lines 241 and 242, and the other leakage detecting line may not be coated outside the other leakage detecting line.

Fig. 9C is different from fig. 9A in that the first leakage detecting line 141 and the second leakage detecting line 142 are formed by coating with a material having an insulating surface (i.e., a conductive material on one surface and an insulating material on the other surface), so that a separate insulating layer is not required. The power supply line 1 of fig. 9C can be used in the power supply line leakage detection protection device of fig. 3-6 as well. In the present embodiment, an aluminum foil single-sided insulating material is used as the first and second

leakage detecting lines

141 and 142. The first and second insulating

layers

151 and 152 are the aluminum foil insulating sides of the single-sided aluminum foil insulating material, and the

drainage wires

141A and 142A are wrapped in the aluminum foil conductive sides. Fig. 9D is different from fig. 9C in that the power supply line 1 includes only the connection line 21. The power supply line 1 of fig. 9D can be used for the power supply line leakage detection protection device in fig. 2, 7-8.

Although the connection lines 11 and 12 (or only the connection line 11) are shown below the first and second

leakage detection lines

141 and 142 in fig. 9A to 9D, it is understood that the connection lines 11 and 12 (or only the connection line 11) may be arranged at any suitable positions, not limited to the positions shown in fig. 9A to 9D. Further, in fig. 9A to 9D, the outer shape of the power cord 1 is circular, but it is understood that the power cord 1 may be a side-by-side flat cord or may have other shapes that can be processed.

A second aspect of the utility model proposes an electrical connection device comprising: a housing; and a power supply line leakage detection protection device according to any one of the above embodiments, the power supply line leakage detection protection device being accommodated in the housing.

A third aspect of the present invention provides an electrical appliance, comprising: a load device; and an electrical connection device coupled between the power supply line and the load device for supplying power to the load device, the electrical connection device including the power line leakage detection protection apparatus in any of the above embodiments.

Thus, while the present invention has been described with reference to specific examples, which are intended to be illustrative only and not to be limiting of the utility model, it will be apparent to those of ordinary skill in the art that changes, additions or deletions may be made to the disclosed embodiments without departing from the spirit and scope of the utility model.

Claims

1. A power line leakage detection protection device, comprising:

a switch module configured to control a power connection between an input and an output of a power line;

a leakage detection module comprising a first leakage detection line and a second leakage detection line, the first leakage detection line enveloping a first current-carrying line in the power supply lines and configured to detect a first leakage current signal on the first current-carrying line or generate a first self-detection fault signal when the first leakage detection line is open, the second leakage detection line enveloping a second current-carrying line in the power supply lines and configured to detect a second leakage current signal on the second current-carrying line or generate a second self-detection fault signal when the second leakage detection line is open; and

a drive module coupled with the switch module and the leakage detection module and configured to:

receiving the first leakage current signal or the first self-test fault signal and driving the switch module to disconnect the power connection in response to the first leakage current signal or the first self-test fault signal; and/or

Receiving the second leakage current signal or the second self-test fault signal and driving the switch module to disconnect the power connection in response to the second leakage current signal or the second self-test fault signal.

2. The power line leakage detection protection device of claim 1, further comprising:

a self-test module coupled to the leakage detection module, the driving module, the first current-carrying line, and the second current-carrying line, and configured to detect whether at least one of the first leakage detection line and the second leakage detection line is open-circuited, and generate the first self-test fault signal in cooperation with the first leakage detection line when the first leakage detection line is open-circuited, and generate the second self-test fault signal in cooperation with the second leakage detection line when the second leakage detection line is open-circuited.

3. The power line leakage detection protection device of claim 2, wherein the driving module comprises:

a coil generating an electromagnetic force for driving the switching module; and

at least one semiconductor element coupled in series to the coil that causes the coil to generate the electromagnetic force under the action of one or more of the first leakage current signal, the second leakage current signal, the first self-test fault signal, and the second self-test fault signal.

4. The power line leakage detection protection device of claim 3, wherein the semiconductor element is selected from one of: silicon controlled, bipolar transistor, field effect transistor and photoelectric coupling element.

5. The power line leakage detection protection device of claim 1, further comprising:

at least one test module comprising a test switch coupled to the leakage detection module,

the drive module is further configured to: when the test switch is closed and the electric leakage detection module works normally, the switch module is driven to disconnect the electric power connection.

6. The power line leakage detection protection device of claim 5, wherein one end of the test switch is coupled to one end of the first leakage detection line and one end of the second leakage detection line, the other end of the test switch is coupled to the first current-carrying line or the second current-carrying line, and the other end of the first leakage detection line and the other end of the second leakage detection line are respectively coupled to the driving module.

7. The power line leakage detection protection device of claim 5, wherein the number of test modules is two, one test switch having one end coupled to one end of the first leakage detection line and the other end coupled to the first current-carrying line, the other end of the first leakage detection line coupled to the driving module, the other test switch having one end coupled to one end of the second leakage detection line and the other end coupled to the second current-carrying line, the other end of the second leakage detection line coupled to the driving module.

8. An electrical connection apparatus, comprising:

a housing; and

the power supply line leakage detection protection device according to any one of claims 1 to 7, which is accommodated in the housing.

9. An electrical consumer, comprising:

a load device;

an electrical connection device coupled between a power supply line and the load device for supplying power to the load device, wherein the electrical connection device comprises the power line leakage detection protection device according to any one of claims 1-7.