CN215897278U - Power line leakage detection protection device, electric connection equipment and electrical appliance - Google Patents

Abstract

The utility model discloses a power line leakage detection protection device, an electric connection device and an electric appliance. The power line leakage detection protection device includes a switch module configured to control a power connection between an input terminal and an output terminal; the leakage detection module comprises a first leakage detection line and a second leakage detection line, wherein the first leakage detection line and the second leakage detection line respectively coat at least one of a first current-carrying line and a second current-carrying line in a power line so as to detect a leakage current signal on the first current-carrying line and/or the second current-carrying line; and a driving module coupled with the switching module and the leakage detection module and configured to receive the leakage current signal and drive the switching module to disconnect the power connection in response to the leakage current signal. The power line leakage detection protection device provided by the utility model 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 work normally, 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 the input and the output; a leakage detection module including a first leakage detection line and a second leakage detection line, the first leakage detection line and the second leakage detection line respectively cover at least one of a first current-carrying line and a second current-carrying line in a power line, so as to detect a leakage current signal on the first current-carrying line and/or the second current-carrying line, and one end of the first leakage detection line is coupled with one end of the second leakage detection line to form a series path for fault detection of the leakage detection module; and a driving module coupled with the switching module and the leakage detection module and configured to receive the leakage current signal and drive the switching module to disconnect the power connection in response to the leakage current signal.

In some embodiments, the leakage detection module further includes a first signal line and a second signal line connected in series in the series path.

In some embodiments, the power line leakage detection protection device further comprises: a self-test module coupled to the electrical 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 electrical leakage detection line, the second electrical leakage detection line, the first signal line, and the second signal line is faulty and generate a self-test fault signal when the at least one of the first electrical leakage detection line, the second electrical leakage detection line, the first signal line, and the second signal line is faulty, wherein the driving module is further configured to receive the self-test fault signal and drive the switching module to disconnect the power connection in response to the self-test fault signal.

In some embodiments, a first end of the first leakage detection line is connected to a first end of the second leakage detection line, a second end of the first leakage detection line is connected to a second end of the first signal line, a second end of the second leakage detection line is connected to a second end of the second signal line, and one of the first end of the first signal line and the first end of the second signal line is coupled to the self-test module and the driving module, and the other is coupled to the self-test module.

In some embodiments, a first end of the first leakage detection line is connected to a first end of the second signal line, a second end of the first leakage detection line is connected to a second end of the first signal line, a second end of the second signal line is connected to a second end of the second leakage detection line, and one of the first end of the first signal line and the first end of the second leakage detection line is coupled to the self-test module and the driving module, and the other is coupled to the self-test module.

In some embodiments, a second terminal of the first leakage detection line is connected to a second terminal of the first signal line, a first terminal of the second leakage detection line is connected to a first terminal of the first signal line, a second terminal of the second leakage detection line is connected to a second terminal of the second signal line, and one of the first terminal of the first leakage detection line and the first terminal of the second signal line is coupled to the self-test module and the driving module, and the other is coupled to the self-test module.

In some embodiments, the power line leakage detection protection device further comprises: the testing module comprises a testing switch, the testing switch is coupled to the electric leakage detection module, and when the testing switch is closed and the electric leakage detection module works normally, the driving module drives the switch module to be disconnected with the power connection.

A second aspect of the present invention proposes an electrical connection device, characterized in that it comprises: 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, characterized in that the electrical consumer comprises: 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 present invention, by providing two leakage detection lines and coupling one ends thereof so as to be connected in series, the formed series path can be used to detect whether or not the two leakage detection lines have failed, so as to ensure the reliability of the power line leakage detection protection device. 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. 2A shows a cross-sectional view of one embodiment of a power cord according to the present invention;

FIG. 2B shows a cross-sectional view of another embodiment of a power cord according to the present invention;

FIG. 3 shows a schematic diagram according to a first embodiment of the utility model;

FIG. 4 shows a schematic diagram of a second embodiment according to the utility model;

FIG. 5 shows a schematic diagram of a third embodiment according to the utility model;

FIG. 6 shows a schematic diagram of a fourth embodiment according to the utility model;

fig. 7 shows a schematic diagram of a fifth embodiment according to the utility model.

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 present invention is directed to a power line leakage detection protection device in which two leakage detection lines are provided and coupled at one end thereof so as to be connected in series, and a series path is formed that can be used to detect whether or not the two leakage detection lines fail.

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 switching module 141, a leakage detection module 142, and a driving module 144. The switching module 141 controls the power connection between the input 11 and the output 12. The leakage detecting module 142 includes a first leakage detecting line and a second leakage detecting line. The first leakage detection line and the second leakage detection line respectively coat at least one of the first current-carrying line and the second current-carrying line in the power line, so that leakage current signals on the first current-carrying line and/or the second current-carrying line are detected, and one end of the first leakage detection line is coupled with one end of the second leakage detection line to form a series circuit for fault detection of the leakage detection module. It should be noted that the first and second leakage detection lines may be coupled together in any manner as long as a series path can be formed. The driving module 144 is coupled to the switching module 141 and the leakage detecting module 142, and receives the leakage current signal and drives the switching module to disconnect the power connection in response to the leakage current signal. By providing two leakage detection lines and coupling their one ends so as to be connected in series, the formed series path can be used to detect whether or not the two leakage detection lines have failed, so as to ensure the reliability of the power supply line leakage detection protection device.

In some embodiments, the leakage detection module 142 further includes a first signal line and a second signal line, which are connected in series in a series path. By using the first signal line and the second signal line, various coupling modes of the first leakage detection line and the second leakage detection line can be realized.

In some embodiments, the power line leakage detection protection device 100 further comprises a self-test module (not shown in fig. 1). The self-test module is coupled to the leakage detection module 142, the driving module 144, the first current-carrying line, and the second current-carrying line, and detects whether at least one of the first leakage detection line, the second leakage detection line, the first signal line, and the second signal line is faulty, and generates a self-test fault signal when the fault occurs. The drive module 144 is also configured to receive the self-test fault signal and drive the switch module 141 to disconnect the power connection in response to the self-test fault signal. Through setting up self-checking module, can detect whether first electric leakage detection line, second electric leakage detection line, first signal line and/or second signal line take place trouble such as open a way, short circuit to break off electric power connection when breaking down, thereby improve power cord electric leakage detection protection device's reliability.

In some embodiments, the power line leakage detection protection device 100 further comprises a test module (not shown in fig. 1). The test module includes a test switch coupled to the leakage detection module 142. When the test switch is closed and the leakage detecting module 142 operates normally, the driving module 144 drives the switch module 141 to disconnect the power connection. Through setting up test module, also can detect whether first electric leakage detection line, second electric leakage detection line, first signal line and/or second signal line take place trouble such as open circuit, short circuit to break off electric power connection when breaking down, thereby improve power cord electric leakage detection protection device's reliability.

Figure 2A shows a cross-sectional view of one embodiment of a power cord according to the present invention. Figure 2B shows a cross-sectional view of another embodiment of a power cord according to the present invention. As shown in fig. 2A and 2B, the power supply line 2 includes a first current-carrying line (e.g., the live line L)21, a second current-carrying line (e.g., the neutral line N)22, a third current-carrying line (e.g., the ground line G)23, a first leakage detection line 241, a second leakage detection line 242, a first signal line 25A, a second signal line 25B, and an insulating coating 27. In fig. 2A, the first signal line 25A and the second signal line 25B are located on both sides of the third current carrier line 23, whereas in fig. 2B, the first signal line 25A and the second signal line 25B are located on the same side of the third current carrier line 23. It is to be understood that the first signal line 25A and the second signal line 25B may be arranged at any suitable positions, and are not limited to the positions shown in fig. 2A and 2B.

In the embodiment of fig. 2A and 2B, the power supply line 2 has a circular shape, and the first current-carrying line 21, the second current-carrying line 22, and the third current-carrying line 23 are respectively covered with an insulating layer. It will be appreciated that the power cord 2 may also be a side-by-side flat cord, or may have other configurations that may be machined. As shown in fig. 2A and 2B, the power supply cord 2 may further include a cord filler (or wadding) 26. The first leakage detection line 241 and the second leakage detection line 242 may be formed by coating a single-sided insulating material (i.e., one side is a conductive material, and the other side is an insulating material), and do not need a separate insulating structure. In some embodiments, the outer faces of the first and second leakage detecting lines 241 and 242 may be respectively coated with an insulating structure. Alternatively, one of the first and second leakage detecting lines 241 and 242 may be coated with an insulating structure on the outer surface thereof, while the other leakage detecting line is not coated with an insulating structure on the outer surface thereof. The first leakage detecting line 241 and the second leakage detecting line 242 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 structure can be integrally formed by plastic materials, and can also be formed by coating insulating paper, cotton and other materials which accord with the electrical insulating property. In the embodiment of fig. 2A and 2B, the first leakage detection line 241 is wrapped outside the insulation layer of the first current carrying line 21, and the second leakage detection line 242 is wrapped outside the insulation structure of the second current carrying line 22. In some embodiments, the first leakage detection line 241 may cover both the first current carrying line 21 and the second current carrying line 22, the junction edge structure covers the first leakage detection line 241 and the third current carrying line 23, and the second leakage detection line 242 covers the junction edge structure. Alternatively, the first leakage detecting line 241 or the second leakage detecting line 242 may cover a plurality of current-carrying lines at the same time.

Fig. 3 shows a schematic diagram of a first embodiment according to the utility model. As shown in fig. 3, the power line leakage detection protection device includes a switch module 141, a leakage detection module 142, a self-test module 143, a driving module 144, and a test module 145. The switch module 141 comprises a RESET switch RESET for controlling the power connection between the input LINE and the output LOAD. The leakage detecting module 142 includes a first leakage detecting line 241, a second leakage detecting line 242, a first signal line 25A, and a second signal line 25B. In this embodiment, the first end of each of the first leakage detecting line 241, the second leakage detecting line 242, the first signal line 25A, and the second signal line 25B 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.

As shown in fig. 3, the first signal line 25A, the first leakage detecting line 241, the second leakage detecting line 242, and the second signal line 25B are connected in series in this order. More specifically, a first end of the first leakage detecting line 241 is connected to a first end of the second leakage detecting line 242 to form connection points C and D; a second end of the first leakage detecting line 241 is connected to a second end of the first signal line 25A to form a connection point B; a second end of the second leakage detecting line 242 is connected to a second end of the second signal line 25B to form a connection point a. The first terminal of the first signal line 25A is connected to one terminal of the resistor R6A of the self-test module 143 and one terminal of the resistor R2 of the driving module 144, and the first terminal of the second signal line 25B is connected to one terminal of the resistor R6B of the self-test module 143. The other end of the resistor R6A is connected to the first current carrying line 21 and the RESET switch RESET of the switching module 141, and the other end of the resistor R6B is connected to the cathode of the SCR of the driving module 144. The driving module 144 further includes a capacitor C1, a resistor R3, and diodes D1 and D2. The capacitor C1 is connected in parallel with the resistor R3, then connected in series with the resistor R2, and connected to the control electrode of the SCR. The anode of the SCR is connected to one end of the solenoid SOL, and the cathode of the SCR is connected to the other end of the capacitor C1 and the resistor R3 which are connected in parallel. The other end of solenoid SOL is connected to second current carrying line 22 and RESET switch RESET. The anode of the diode D1 is connected to the cathode of the thyristor SCR, and its cathode is connected to the first current carrying line 21 and the RESET switch RESET. The diode D2 is a common diode of the self-test module 143 and the driving module 144, and has an anode connected to the cathode of the SCR and a cathode connected to the anode of the SCR. The TEST module 145 includes a resistor R4 and a TEST switch TEST, one end of the resistor R4 is connected to one end of the TEST switch TEST, the other end of the resistor R4 is connected to the first current-carrying line 21 and the RESET switch RESET, and the other end of the TEST switch TEST is connected to a first end of the second signal line 25B and one end of the resistor R6B. In this embodiment, the first current-carrying line 21, the resistor R4, the TEST switch TEST, the second signal line 25B, the second leakage detecting line 242, the first leakage detecting line 241, the first signal line 25A, the resistor R2, the resistor R3, the diode D2, the solenoid SOL, and the second current-carrying line 22 form a TEST circuit.

When the first leakage detection line 241, the second leakage detection line 242, the first signal line 25A and the second signal line 25B all work normally (are not opened or broken), the point B is limited to a lower potential by setting the resistance values of the resistors R6A and R6B, the thyristor SCR cannot be triggered, the output power supply is switched on, and the product works normally. When any line of the first leakage detection line 241, the second leakage detection line 242, the first signal line 25A and the second signal line 25B is opened or broken, a current path from the first current-carrying line 21-R6A-R2-R3-D2-SOL to the second current-carrying line 22 is formed, and the voltage across the resistor R3 rises to trigger the conduction of the silicon controlled rectifier SCR. When the SCR is turned on, a trip loop is formed from the second current carrying line 22-SOL-SCR-D1 to the first current carrying line 21, and a large current is generated on the solenoid SOL, so that a magnetic field is formed which is large enough to trip the RESET switch RESET, thereby cutting off the power supply.

In addition to self-test module 143, fault testing of leakage detection module 142 may also be performed by test module 145. When the TEST is not needed, the TEST switch TEST is turned on, and when the first leakage detection line 241, the second leakage detection line 242, the first signal line 25A and the second signal line 25B all work normally and no leakage occurs between the first leakage detection line 241 and the first current-carrying line 21 and between the second leakage detection line 242 and the second current-carrying line 22, the silicon controlled rectifier SCR is not triggered, and the product works normally. When the TEST switch TEST is closed, that is, the TEST circuit is a closed loop, a dummy leak current flows in the TEST circuit. This simulated leakage current will cause the voltage across resistor R3 to rise, triggering the SCR to turn on. When the silicon controlled rectifier SCR is conducted, the tripping loop is formed, and a large current is generated on the solenoid SOL to form a large enough magnetic field, so that the RESET switch RESET is tripped, and the power supply is cut off. If any line of the first leakage detection line 241, the second leakage detection line 242, the first signal line 25A and the second signal line 25B is opened or broken, when the TEST switch TEST is closed, the TEST circuit cannot form a closed loop, no simulation leakage current flows through the TEST circuit, the silicon controlled rectifier SCR cannot be triggered, and the RESET switch RESET cannot be tripped. At this time, the user is prompted that at least one of the first leakage detecting line 241, the second leakage detecting line 242, the first signal line 25A, and the second signal line 25B may have an open circuit or an open circuit. Accordingly, the user can detect whether the first leakage detecting line 241, the second leakage detecting line 242, the first signal line 25A, and the second signal line 25B are intact by operating the TEST switch TEST. It will be appreciated that in addition to detecting a failure of leakage detection module 142, test module 14 may also be used to detect whether other components in the test circuit have failed.

Fig. 4 shows a schematic diagram of a second embodiment according to the utility model. In the embodiment of fig. 4, only the first leakage detecting line 241, the second leakage detecting line 242, the first signal line 25A, and the second signal line 25B are connected in a different manner from the embodiment of fig. 3. In this embodiment, the first signal line 25A, the first leakage detecting line 241, the second signal line 25B, and the second leakage detecting line 242 are connected in series in this order. More specifically, a first end of the first leakage detecting line 241 is connected to a first end of the second signal line 25B, forming a connection point C; a second end of the first leakage detecting line 241 is connected to a second end of the first signal line 25A to form a connection point B; a second end of the second signal line 25B is connected to a second end of the second leakage detecting line 242 to form a connection point D. The first end of the first signal line 25A is connected to one end of the resistor R6A and one end of the resistor R2, and the first end of the second leakage detecting line 242 is connected to one end of the resistor R6B and one end of the TEST switch TEST.

In this embodiment, the first current-carrying line 21, the resistor R4, the TEST switch TEST, the second leakage detection line 242, the second signal line 25B, the first leakage detection line 241, the first signal line 25A, the resistor R2, the resistor R3, the diode D2, the solenoid SOL, and the second current-carrying line 22 form a TEST circuit. The working principle of the self-test module 143 and the test module 145 is the same as that of the embodiment of fig. 3, and will not be described herein again.

Fig. 5 shows a schematic diagram of a third embodiment according to the utility model. In the embodiment of fig. 5, the leakage detecting module 142 is the same as the embodiment of fig. 4, and will not be described herein again. In this embodiment, a first terminal of the first signal line 25A is connected to one terminal of a resistor R6A and one terminal of a TEST switch TEST, and the other terminal of the resistor R6A is connected to a cathode of a silicon controlled rectifier SCR. A first terminal of the second leakage detecting line 242 is connected to one terminal of the resistor R6B and one terminal of the resistor R2, and the other terminal of the resistor R6B is connected to the first current-carrying line 21 and the RESET switch RESET.

When the first leakage detection line 241, the second leakage detection line 242, the first signal line 25A and the second signal line 25B all work normally (are not opened or broken), the point a is limited to a lower potential by setting the resistance values of the resistors R6A and R6B, the silicon controlled rectifier SCR cannot be triggered, the output power supply is switched on, and the product works normally. When any line of the first leakage detection line 241, the second leakage detection line 242, the first signal line 25A and the second signal line 25B is opened or broken, a current path from the first current-carrying line 21-R6B-R2-R3-D2-SOL to the second current-carrying line 22 is formed, and the voltage across the resistor R3 rises to trigger the conduction of the silicon controlled rectifier SCR. When the SCR is turned on, a trip loop is formed from the second current carrying line 22-SOL-SCR-D1 to the first current carrying line 21, and a large current is generated on the solenoid SOL, so that a magnetic field is formed which is large enough to trip the RESET switch RESET, thereby cutting off the power supply.

In this embodiment, the first current-carrying line 21, the resistor R4, the TEST switch TEST, the first signal line 25A, the first leakage detection line 241, the second signal line 25B, the second leakage detection line 142, the resistor R2, the resistor R3, the diode D2, the solenoid SOL, and the second current-carrying line 22 form a TEST circuit. The operation principle of the testing module 145 is the same as that of the embodiment of fig. 3, and will not be described herein.

Fig. 6 shows a schematic diagram of a fourth embodiment according to the utility model. In the embodiment of fig. 6, the leakage detecting module 142 is the same as the embodiment of fig. 4, and will not be described herein again. In this embodiment, one end of the solenoid SOL is connected to the first current carrying line 21, and the cathode of the diode D1 is connected to the second current carrying line 22.

When the first leakage detection line 241, the second leakage detection line 242, the first signal line 25A and the second signal line 25B all work normally (are not opened or broken), the point B is limited to a lower potential by setting the resistance values of the resistors R6A and R6B, the thyristor SCR cannot be triggered, the output power supply is switched on, and the product works normally. When any line of the first leakage detection line 241, the second leakage detection line 242, the first signal line 25A and the second signal line 25B is opened or broken, a current path from the first current-carrying line 21-R6A-R2-R3-D1 to the second current-carrying line 22 is formed, and the voltage across the resistor R3 rises, so that the SCR is triggered to be turned on. When the SCR is turned on, a trip loop is formed from the first current carrying line 21-SOL-SCR-D1 to the second current carrying line 22, and a large current is generated on the solenoid SOL, so that a magnetic field is formed which is large enough to trip the RESET switch RESET, thereby cutting off the power supply.

In this embodiment, the first current-carrying line 21, the resistor R4, the TEST switch TEST, the second leakage detection line 242, the second signal line 25B, the first leakage detection line 241, the first signal line 25A, the resistor R2, the resistor R3, the diode D1, and the second current-carrying line 22 form a TEST circuit. The operation principle of the testing module 145 is the same as that of the embodiment of fig. 3, and will not be described herein.

Fig. 7 shows a schematic diagram of a fifth embodiment according to the utility model. In the embodiment of fig. 7, only the first leakage detecting line 241, the second leakage detecting line 242, the first signal line 25A, and the second signal line 25B are connected in a different manner from the embodiment of fig. 3. In this embodiment, the first leakage detection line 241, the first signal line 25A, the second leakage detection line 242, and the second signal line 25B are connected in series in this order. More specifically, the second end of the first leakage detecting line 241 is connected to the second end of the first signal line 25A to form a connection point C; a first end of the second leakage detecting line 242 is connected to a first end of the first signal line 25A to form a connection point D; a second end of the second leakage detecting line 242 is connected to a second end of the second signal line 25B to form a connection point a. A first terminal of the first leakage detection line 241 is connected to one terminal of the resistor R6A and one terminal of the resistor R2, and a first terminal of the second signal line 25B is connected to one terminal of the resistor R6B and one terminal of the TEST switch TEST.

In this embodiment, the first current-carrying line 21, the resistor R4, the TEST switch TEST, the second signal line 25B, the second leakage detection line 242, the first signal line 25A, the first leakage detection line 241, the resistor R2, the resistor R3, the diode D2, the solenoid SOL, and the second current-carrying line 22 form a TEST circuit. The working principle of the self-test module 143 and the test module 145 is the same as that of the embodiment of fig. 3, and will not be described herein again.

In the above embodiment, by providing two leakage detection lines and coupling their one ends so as to be connected in series, the formed series path can be used to detect whether or not the two leakage detection lines have failed, so as to ensure the reliability of the power supply line leakage detection protection device. 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.

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 (9)

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

a switch module configured to control a power connection between the input and the output;

a leakage detection module including a first leakage detection line and a second leakage detection line, the first leakage detection line and the second leakage detection line respectively cover at least one of a first current-carrying line and a second current-carrying line in a power line, so as to detect a leakage current signal on the first current-carrying line and/or the second current-carrying line, and one end of the first leakage detection line is coupled with one end of the second leakage detection line to form a series path for fault detection of the leakage detection module; and

a driving module coupled with the switching module and the leakage detection module and configured to receive the leakage current signal and drive the switching module to disconnect the power connection in response to the leakage current signal.

2. The power line leakage detection protection device of claim 1, wherein said leakage detection module further comprises a first signal line and a second signal line, said first signal line and said second signal line being connected in series in said series path.

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

a self-test module coupled with 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, the second leakage detection line, the first signal line and the second signal line is failed and generate a self-test failure signal when the failure occurs, wherein,

the drive module is further configured to receive the self-test fault signal and drive the switch module to disconnect the power connection in response to the self-test fault signal.

4. The power line leakage detection protection device of claim 3,

a first end of the first leakage detection line is connected to a first end of the second leakage detection line, a second end of the first leakage detection line is connected to a second end of the first signal line, a second end of the second leakage detection line is connected to a second end of the second signal line, and one of the first end of the first signal line and the first end of the second signal line is coupled to the self-test module and the driving module, and the other is coupled to the self-test module.

5. The power line leakage detection protection device of claim 3,

a first end of the first leakage detection line is connected to a first end of the second signal line, a second end of the first leakage detection line is connected to a second end of the first signal line, a second end of the second signal line is connected to a second end of the second leakage detection line, and one of the first end of the first signal line and the first end of the second leakage detection line is coupled to the self-test module and the driving module, and the other is coupled to the self-test module.

6. The power line leakage detection protection device of claim 3,

the second end of the first leakage detection line is connected with the second end of the first signal line, the first end of the second leakage detection line is connected with the first end of the first signal line, the second end of the second leakage detection line is connected with the second end of the second signal line, one of the first end of the first leakage detection line and the first end of the second signal line is coupled to the self-checking module and the driving module, and the other one of the first end of the first leakage detection line and the first end of the second signal line is coupled to the self-checking module.

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

the testing module comprises a testing switch, the testing switch is coupled to the electric leakage detection module, and when the testing switch is closed and the electric leakage detection module works normally, the driving module drives the switch module to be disconnected with the power connection.

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 housed in the housing.

9. An electrical consumer, characterized in that it comprises:

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 apparatus according to any one of claims 1-7.

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