CN212908971U

CN212908971U - Intelligent power line leakage current detection device

Info

Publication number: CN212908971U
Application number: CN202021831041.2U
Authority: CN
Inventors: 李成力; 聂胜云
Original assignee: Suzhou Ele Mfg Co ltd
Current assignee: Suzhou Ele Mfg Co ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-04-06
Anticipated expiration: 2030-08-28

Abstract

The utility model discloses an intelligent power cord leakage current detection device, include: a switch module configured to control a power connection between the input and the output; the leakage detection module comprises a first leakage detection line and a second leakage detection line which are connected in series and are respectively used for detecting whether leakage current signals exist in the first power supply line and the second power supply line; the detection monitoring module is connected with the first electric leakage detection line and the second electric leakage detection line in series and then is coupled to the first power supply line and the second power supply line and is used for detecting whether open-circuit fault signals exist in the first electric leakage detection line and the second electric leakage detection line or not; and a driving module coupled to the switching module, the leakage detection module and the detection monitoring module and configured to receive the leakage current signal and/or the open fault signal to drive the switching module to disconnect the power connection. The utility model discloses a whether realize detecting first electric leakage detection line and second electric leakage detection line intact reliability of guaranteeing power cord leakage current detection device.

Description

Intelligent power line leakage current detection device

Technical Field

The utility model relates to an electric field especially relates to an intelligent power cord leakage current detection device.

Background

The power line Leakage Current Detector (LCDI) 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 equipment to prevent fire so as to provide safety protection. The electric arc fault fire caused by power line damage and insulation strength reduction caused by aging, abrasion, extrusion or animal biting of a live wire, a zero wire and a ground wire in the power line is prevented.

Existing LCDI devices (see fig. 1) suffer from the following drawbacks: when the leakage detection line (or shielding line) (24 in fig. 1) of L (21 in fig. 1) or N (22 in fig. 1) in the power line (2 in fig. 1) is open and the circuit break does not have a protection function, the product can still work normally. There are fire hazards or other electrical safety hazards.

Therefore, a power supply line leakage current detection device capable of effectively detecting a leakage current detection line is required.

SUMMERY OF THE UTILITY MODEL

Based on the above problem, the utility model provides an intelligent power cord leakage current detection device, include: a switch module configured to control a power connection between the input and the output; the leakage detection module comprises a first leakage detection line and a second leakage detection line which are connected in series and are respectively used for detecting whether leakage current signals exist in the first power supply line and the second power supply line; a detection monitoring module, which is connected in series with the first leakage detection line and the second leakage detection line and then coupled to the first power supply line and the second power supply line, for detecting whether there is an open-circuit fault signal in the first leakage detection line and the second leakage detection line; and a drive module coupled to the switch module, the leakage detection module, and the detection monitoring module, and configured to receive the leakage current signal and/or the open-circuit fault signal to drive the switch module to disconnect the power connection.

In one embodiment, the detection and monitoring module comprises at least one resistor and/or at least one diode.

In one embodiment, the detection monitoring module includes a first diode, a first resistor, a second diode, and a second resistor, a first pole of the first diode being connected with a first end of the first resistor and a second pole of the first diode being connected with one of the first power supply line and the second power supply line, a second end of the first resistor being connected to the first leakage detection line, a first pole of the second diode being connected to the other of the second power supply line and the first power supply line, a second pole of the second diode being connected with a first end of the second resistor and a second end of the second resistor being coupled to the second leakage detection line.

In one embodiment, the detection monitoring module includes a first resistor, a second resistor, and a first diode.

In one embodiment, the first diode is a common diode of the driving module and the detection monitoring module.

In one embodiment, a first end of the first resistor is coupled to one of the first and second supply lines via the first diode and the drive module, and a second end of the first resistor is connected to the first leakage detection line, the second resistor being coupled between the other of the first and second supply lines and the second leakage detection line.

In one embodiment, a first end of the first resistor is coupled to one of the first and second supply lines via the first diode, a second end of the first resistor is connected to the first leakage detection line, and the second resistor is coupled between the other of the first and second supply lines and the second leakage detection line via the drive module.

In one embodiment, a first end of the first resistor is coupled to one of the first and second power supply lines via the first diode, and a second end of the first resistor is connected to the first leakage detection line, the second resistor being coupled between the other of the first and second power supply lines and the second leakage detection line.

In one embodiment, the first resistor is coupled between one of the first and second supply lines and the first leakage detection line, a first end of the second resistor is connected to the other of the first and second supply lines and a second end of the second resistor is connected to the second leakage detection line and to the first pole of the first diode via a third resistor.

In one embodiment, a first pole of the first diode is connected to a first end of the first resistor, a second pole of the first diode is connected to one of the first power supply line and the second power supply line, a second end of the first resistor is connected to the first leakage detection line, and the second resistor is coupled between the other of the first power supply line and the second leakage detection line.

In one embodiment, the first resistor is coupled between one of the first and second power supply lines and the first leakage detection line, a first pole of the first diode is connected to the other of the first and second power supply lines, a second pole of the first diode is connected to a first end of the second resistor, and a second end of the second resistor is connected to the second leakage detection line.

In one embodiment, the first resistor is coupled between one of the first and second supply lines and the first leakage detection line, a first end of the second resistor is connected to the other of the first and second supply lines, a second end of the second resistor is connected to the second leakage detection line and to a first pole of the first diode, a second pole of the first diode is coupled to the drive module.

In one embodiment, the detection monitoring module includes a full-wave bridge rectifier, a first resistor and a second resistor, the full-wave bridge rectifier being shared by the monitoring module and the driving module.

In one embodiment, a first end of the full-wave bridge rectifier is connected to one of the first and second supply lines, a second end of the full-wave bridge rectifier is connected to a first end of the first resistor, a second end of the first resistor is connected to the first leakage detection line, a third end of the full-wave bridge rectifier is coupled to the other of the first and second supply lines, a fourth end of the full-wave bridge rectifier is connected to a first end of the second resistor, and a second end of the second resistor is connected to the second leakage detection line.

In one embodiment, the testing module further comprises a testing switch coupled to the switch module, the leakage detection module and the detection monitoring module, and the driving module drives the switch module to disconnect the power connection when the testing switch is closed and the first leakage detection line and the second leakage detection line are normally operated.

The utility model discloses a whether realize detecting first electric leakage detection line and second electric leakage detection line intact reliability of guaranteeing power cord leakage current detection device.

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.

FIG. 1 is a technical schematic diagram of a conventional LCDI apparatus;

fig. 2 is a schematic structural diagram of an external shape of a power plug according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the external power cord of FIG. 2;

fig. 4A is a schematic diagram of a first embodiment according to the present invention;

fig. 4B is a schematic diagram of a second embodiment according to the present invention;

fig. 5A is a schematic diagram of a third embodiment according to the present invention;

fig. 5B is a schematic diagram of a fourth embodiment according to the present invention;

fig. 6A is a schematic diagram of a fifth embodiment according to the present invention;

fig. 6B is a schematic diagram of a sixth embodiment according to the present invention;

fig. 7 is a schematic diagram of a seventh embodiment according to the present invention;

fig. 8 is a schematic diagram of an eighth embodiment according to the present invention;

fig. 9 is a schematic diagram of a ninth embodiment according to the present invention;

fig. 10 is a schematic diagram of a tenth embodiment 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 invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. 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 is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

As used herein, the terms "include," "include," and similar terms are to be construed as open-ended terms, i.e., "including/including but not limited to," meaning that additional content can be included as well. 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.

The utility model provides an intelligent power cord leakage current detection device includes: a switch module configured to control a power connection between the input and the output; the leakage detection module comprises a first leakage detection line and a second leakage detection line which are connected in series and are respectively used for detecting whether leakage current signals exist in the first power supply line and the second power supply line; a detection monitoring module coupled to the leakage detection module and connected in series with the first and second leakage detection lines for detecting whether an open circuit fault signal is present in the first and second leakage detection lines; and a driving module comprising at least one semiconductor element, the driving module being coupled to the switching module, the leakage detection module and the detection monitoring module and configured to receive the leakage current signal and/or the open fault signal to drive the switching module to disconnect the power connection.

As shown in fig. 2, the utility model provides an intelligent power cord leakage current detection device is including plug portion 1 and external power cord 2 that have switch module, and wherein, plug portion 1 still is provided with TEST switch TEST and RESET switch RESET. In the embodiment shown in fig. 2, the power supply line 2 includes a live line (L)21, a neutral line (N)22, a ground line (G)23, leakage detection lines (shield lines) 241 and 242, and an insulating outer cover 27. The power cord 2 may be round in shape, with the live, neutral and

ground wires

21, 22 and 23 being coated with

insulating layers

21A, 22A and 23A, respectively (as shown in fig. 3), and in the embodiment shown in fig. 3, the

leakage detection wire

241 and 242 surrounding the

insulating layers

21A, 22A, respectively, it being understood that the power cord 2 may also be flat side-by-side wires, or the power cord 2 may be other finished shapes. It is understood that in other embodiments, only other signal lines may be included in the power supply line 2. As shown in fig. 3, the power cord 2 may further include a cord filler (or wadding) 26. The outer surface of leakage detection line 241 is coated with insulation structure 28, and the outer surface of leakage detection line 242 is not coated with insulation structure 28 (as shown in the figure), it should be understood that the outer surface of leakage detection line 242 may be coated with insulation structure 28, and the outer surface of leakage detection line 241 is not coated with insulation structure 28 (not shown in the figure), or leakage detection line 241 and leakage detection line 242 may be coated with insulation structure 28 (not shown in the figure). The

leakage detecting lines

241 and 242 may be a metal (e.g., copper, aluminum, etc.) woven structure (as shown in fig. 3), a wound structure (not shown) formed by at least one metal wire, a metal foil-clad structure (not shown), or a combination of any of the above structures. The insulating structure 28 may be integrally formed of a plastic material, or may be formed by covering with an insulating paper, cotton, or other material having electrical insulating properties. The

leakage detecting lines

241 and 242 may be formed by coating with a single-sided insulating material (i.e., one side is conductive and the other side is insulating), without a separate insulating structure 28 (not shown). The leakage detection line 241 is wrapped around at least one power supply line (a current-carrying core line such as a live line (L)21, a neutral line (N)22, etc.), the leakage detection line 241 may wrap around both the live line 21 and the neutral line 22, the knot edge structure 28 wraps around the leakage detection line 241 and the ground line 23 and the leakage detection line 242 wraps around the knot edge structure 28, it being understood that the leakage detection line 241 or the leakage detection line 242 may wrap around multiple power supply lines (current-carrying core lines) at the same time.

Fig. 4A is a schematic diagram of a first embodiment according to the present invention. As shown in fig. 4A, the intelligent power LINE leakage current detection apparatus 100 includes a switch module 141, a leakage detection module 142, a detection monitoring module 143, and a driving module 144, the switch module 141 includes a RESET switch RESET, the switch module 141 is configured to control a power connection between an input terminal LINE and an output terminal LOAD, the leakage detection module 142 includes at least leakage detection LINEs 241 and 242, the leakage detection LINEs 241 and 242 are connected in series through a terminal C of the leakage detection LINE 241 and a terminal D of the leakage detection LINE 242 for detecting whether a leakage current signal exists in the power supply LINE L and the power supply LINE N, respectively, the detection monitoring module 143 is configured to detect whether an open-circuit fault signal exists in the leakage detection LINE 241 and the leakage detection LINE 242, the detection monitoring module 143 includes diodes D4A and D4B and resistors R6A and R6B, an anode of the diode D4A is connected in series with one terminal of the resistor R6A, a cathode of the diode D4A is connected to the power supply line L and coupled to the RESET switch RESET of the switching module 141 via the power supply line L, and the other end of the resistor R6A is connected to the B terminal of the leakage detection line 241, a cathode of the diode D4B is connected in series with one end of the R6B, the other end of the R6B is connected to the a terminal of the leakage detection line 242 and to one end of the resistor R2, an anode of the diode D4B is connected to an anode of the thyristor SCR of the driving module 144 and one end of the solenoid SOL, the other end of the solenoid SOL is connected to the power supply line N and coupled to the RESET switch RESET of the switching module 141 via the power supply line N, the driving module 144 further includes diodes D1 and D2, capacitors C1, R2 and R3, the cathode and the control electrodes of the SCR are connected to both ends of the capacitor C1, the capacitor C1 is connected in parallel to the resistor R3, and the other end of the resistor R2 is, the anode of diode D1 is connected to the cathode of the SCR, and the cathode of diode D1 is connected to the supply line L and line-connected to the switching module 141 via the supply line L.

The working principle of the embodiment shown in fig. 4A is as follows: when the

leakage detection lines

241 and 242 normally operate (are not opened), the resistors R6A and R6B are set, the point a is limited to a low potential, the thyristor SCR is not triggered, and the LCDI switches on the output power supply to normally operate. When any position on the leakage detection lines 241 and/or 242 is opened or broken, a current path from the N line-SOL-D4B-R6B-R2-R3-D1 to the L line is formed, the voltage at two ends of the resistor R3 rises, the SCR is triggered to be conducted, a current loop from the N line-SOL-SCR-D1 to the L line is formed, and the SOL generates a magnetic field to enable the RESET switch to trip, so that the power supply is cut off.

As shown in fig. 4A, the intelligent power line leakage current detection apparatus 100 further includes a TEST module 145, the TEST module 145 includes a resistor R4 and a TEST switch TEST, one end of the resistor R4 is connected in series with one end of the TEST switch TEST, the other end of the resistor R4 is connected to the power supply line L and coupled to the switch module 141 via the power supply line L, and the other end of the TEST switch TEST is coupled between the resistor R6A and the leakage detection line 241. The TEST switch TEST is normally turned on, and when the

leakage detection lines

241 and 242 normally operate (are not open), or when no current leakage occurs between the

power supply lines

21, 22 and 23 and the

leakage detection lines

241 and 242, the silicon controlled rectifier SCR is not triggered, and the product normally operates. When the TEST switch TEST is closed, the analog leakage current forms a TEST loop from the L line through the resistor R4, the TEST switch TEST, the

leakage detection lines

241, 242, and the resistors R2, R3, the diode D2, the solenoid SOL to the N line. The simulated leakage current will increase the voltage across the resistor R3, which in turn drives the SCR to turn on. As can be seen from fig. 4A, when the SCR is turned on, the N line, the solenoid SOL, the SCR, and the diode D1 form a trip circuit, and a large current is generated on the solenoid SOL to form a magnetic field large enough to trip the RESET switch, thereby cutting off the power supply. If any line or element in the TEST loop is open, the product will not trip when the TEST switch TEST is closed. Therefore, the user can detect whether the

leakage detecting lines

241, 242 of the power supply lines are intact by operating the TEST switch TEST. It will be appreciated that depending on the application, it may be possible to detect whether any of the components in the test loop are functioning properly.

Fig. 4B is a schematic diagram of a second embodiment according to the present invention. The difference from the first embodiment shown in fig. 4A is that the detection monitoring module 143 does not include diodes D4A and D4B, and the detection monitoring module 143 includes resistors R6A, R6B and a diode D1, wherein one end of R6A is connected to the B terminal of the leakage detection line 241, the other end of R6A is connected to the cathode of the thyristor SCR, and the resistor R6B is connected between the anode of the thyristor SCR and the a terminal of the leakage detection line 242. Diode D1 is a common diode for driver module 144 and monitor detection module 143.

When the

leakage detection lines

241 and 242 normally operate (are not opened), the resistors R6A and R6B are set, the point a is limited to a low potential, the thyristor SCR is not triggered, and the LCDI switches on the output power supply to normally operate. When any position on the leakage detection lines 241 and/or 242 is opened or broken, a current path from the N line-SOL-R6B-R2-R3-D1 to the L line is formed, the voltage at two ends of the resistor R3 rises, and then the SCR is triggered to be conducted, a current loop from the N line-SOL-SCR-D1 to the L line is formed, and the SOL generates a magnetic field to enable the RESET switch RESET to be tripped, so that the power supply is cut off.

In this embodiment, the operation principle of the testing module 145 is the same as that of the testing module in the first embodiment, and the operation is the same and is not described herein again.

Fig. 5A is a schematic diagram of a third embodiment according to the present invention. The difference from the first embodiment shown in fig. 4A is that the detection monitoring module 143 does not include D4B, the detection monitoring module 143 includes a diode D4A, a resistor R6A and a resistor R6B, and one end of the resistor R6B is directly connected to the power supply line N and coupled to the switch module 141 via the power supply line N, and the other end of the resistor R6B is connected to the a end of the leakage detection line 242.

When the

leakage detection lines

241 and 242 normally operate (are not opened), the resistors R6A and R6B are set, the point a is limited to a low potential, the thyristor SCR is not triggered, and the LCDI switches on the output power supply to normally operate. When any position on the leakage detection lines 241 and/or 242 is opened or broken, a current path from the N line-R6B-R2-R3-D1 to the L line is formed, the voltage at two ends of the resistor R3 rises, and then the SCR is triggered to be conducted, a current loop from the N line-SOL-SCR-D1 to the L line is formed, and the SOL generates a magnetic field to enable the RESET switch to be tripped, so that the power supply is cut off.

In this embodiment, the operation principle of the testing module 145 is the same as that of the testing module in the first embodiment, and the same functions are not described herein again.

Fig. 5B is a schematic diagram of a fourth embodiment according to the present invention. The same components as those of the detection monitoring module 143 of the second embodiment shown in fig. 4B, except that the resistor R6B is connected in such a manner that, in fig. 5B, R6B does not pass through the solenoid SOL, one end of R6B is directly connected to the N-line and coupled to the switch module 141 via the N-line, and the other end of R6B is connected to the a-terminal of the leakage detection line 242.

When the

leakage detection lines

Fig. 6A is a schematic diagram of a fifth embodiment according to the present invention. The difference from the first embodiment shown in fig. 4A is that the detection monitoring module 143 does not include D4A, the detection monitoring module 143 includes a resistor R6A, diodes D4B and R6B, and one end of the resistor R6A is connected to an N line and coupled to the switching module 141 via the N line, the other end of the resistor R6A is connected to the B end of the leakage detection line 241, the anode of the diode D4B is directly connected to an L line without passing through the solenoid SOL and coupled to the switching module 141 via the L line, the cathode of the diode D4B is connected to one end of the resistor R6B, and the other end of the resistor R6B is connected to the a end of the leakage detection line 242.

When the

leakage detection lines

241 and 242 normally operate (are not opened), the resistors R6A and R6B are set, the point a is limited to a low potential, the thyristor SCR is not triggered, and the LCDI switches on the output power supply to normally operate. When any position on the leakage detection lines 241 and/or 242 is opened or broken, a current path from an L line-D4B-R6B-R2-R3-D2-SOL to an N line is formed, the voltage at two ends of the resistor R3 rises, then the SCR is triggered to be conducted, a current loop from the N line-SOL-SCR-D1 to the L line is formed, and the SOL generates a magnetic field to enable the RESET switch RESET to be tripped, so that the power supply is cut off.

In this embodiment, the working principle of the test module 145 is the same as that of the test module in the first embodiment except that the resistor R4 is connected to the N line, and the direction of the test loop is from the N line to the L line during the test.

Fig. 6B is a schematic diagram of a sixth embodiment according to the present invention. The difference from the fifth embodiment shown in fig. 6A is that the detection and monitoring module 143 does not include D4B, the detection and monitoring module 143 is composed of resistors R6A, R6B and a diode D2, wherein the left end of the resistor R6A (the left end of the orientation is referred to fig. 6B) is not connected to the N line but to the cathode of the SCR, and the diode D2 is a common diode of the driving module 144 and the detection and monitoring module 143.

When the

leakage detection lines

241 and 242 normally operate (are not opened), the resistors R6A and R6B are set, the point a is limited to a low potential, the thyristor SCR is not triggered, and the LCDI switches on the output power supply to normally operate. When any position on the leakage detection lines 241 and/or 242 is opened or broken, a current path from an L line-R6B-R2-R3-D2-SOL to an N line is formed, the voltage at two ends of the resistor R3 rises, and then the SCR is triggered to be conducted, a current loop from the N line-SOL-SCR-D1 to the L line is formed, and the SOL generates a magnetic field to enable a RESET switch RESET to be tripped, so that the power supply is cut off.

In this embodiment, the operation principle of the testing module 145 is the same as that of the testing module in the fifth embodiment of fig. 6A, and the functions are the same and are not described herein again.

Fig. 7 is a schematic diagram of a seventh embodiment according to the present invention. The difference from the third embodiment of fig. 5A is that the detection monitoring module 143 does not include D4A, the detection monitoring module 143 includes resistors R6A, R6B and a diode D4, and the diode D4 intelligent power line leakage current detection device is coupled between the a terminal of the leakage detection line 242 and the resistor R2. The function of D4 is to prevent one half cycle of ac from discharging the stored energy of the C1 capacitor and failing to trigger the SCR.

When the

leakage detection lines

241 and 242 normally operate (are not opened), the resistors R6A and R6B are set, the point a is limited to a low potential, the thyristor SCR is not triggered, and the LCDI switches on the output power supply to normally operate. When any position on the leakage detection lines 241 and/or 242 is opened or broken, a current path from the N line-R6B-D4-R2-R3-D1 to the L line is formed, the voltage at two ends of the resistor R3 rises, the SCR is triggered to be conducted, a current loop from the N line-SOL-SCR-D1 to the L line is formed, and the SOL generates a magnetic field to enable the RESET switch RESET to be tripped, so that the power supply is cut off.

In this embodiment, the operation principle of the testing module 145 is the same as that of the testing module in the fifth embodiment of fig. 5A, and the functions are the same and are not described herein again.

Fig. 8 is a schematic diagram of an eighth embodiment according to the present invention. The difference from the seventh embodiment of fig. 7 is that the diode D4 is connected, in fig. 8, the diode D4 is a common diode for the detection monitoring module and the driving module, the cathode of the diode D4 is connected to the control electrode of the SCR, and the anode of the diode D4 is coupled between the resistor R2 and the resistor R3. The function of D4 is the same as that of the seventh embodiment of fig. 7.

When the

leakage detection lines

In this embodiment, the working principle of the testing module 145 is the same as that of the testing module in the eighth embodiment, and the functions are the same and are not described herein again.

Fig. 9 is a schematic diagram of a ninth embodiment according to the present invention. The detection monitoring module 143 includes a full-wave bridge rectifier, resistors R1 and R4, the full-wave bridge rectifier is shared by the detection monitoring module and the driving module, an upper end (i.e., a first end) of the full-wave bridge rectifier is connected to the L line, a right end (i.e., a second end) of the full-wave bridge rectifier is connected to an anode of the SCR, a lower end (i.e., a third end) of the full-wave bridge rectifier is connected to a left end (i.e., a fourth end) of the N-line full-wave bridge rectifier via a solenoid SOL, a resistor R1 is connected between the anode of the SCR and a B end of the leakage detection line 241, and a resistor R4 is connected between the cathode.

When the

leakage detection lines

241 and 242 normally operate (are not opened), the resistors R1 and R4 are set, the point B is limited to a lower potential, the silicon controlled rectifier SCR is not triggered, and the LCDI is connected to the output power supply to normally operate. When any position on the leakage detection lines 241 and/or 242 is opened or broken, a current path from an L line-D1-R1-R2-R3-D3-SOL to an N line is formed, the voltage at two ends of the resistor R3 rises, the SCR is triggered to be conducted, a current loop of the N line-SOL-D4-SCR-D2-L line is formed, and the SOL generates a magnetic field to enable the RESET switch RESET to be tripped, so that the power supply is cut off.

In this embodiment, the testing module 145 has the same principle and function as those of the testing modules of the previous embodiments, except that the testing module 145 only includes the testing switch TEST, the testing switch TEST and the a terminal of the leakage detecting line 242 are normally turned on, and when the

leakage detecting lines

241 and 242 are normally operated (not opened) or no current leakage current occurs between the

power supply lines

21, 22, 23 and the

leakage detecting lines

241 and 242, the SCR is not triggered, and the product will normally operate. When the TEST switch TEST is closed, the analog leakage current forms a TEST loop from the L line through the TEST switch TEST, the

leakage detection lines

241, 242, and the resistors R2, R3, the diode D3, the solenoid SOL to the N line. The simulated leakage current will increase the voltage across the resistor R3, which in turn drives the SCR to turn on to trip the RESET switch and thus cut off the power supply.

Fig. 10 is a schematic diagram of a tenth embodiment according to the present invention. The difference from the ninth embodiment shown in fig. 9 is that the upper end of the full-wave bridge rectifier is connected to the N line, the lower end of the full-wave bridge rectifier is connected to the L line via the solenoid SOL, and the TEST switch TEST is connected to the B terminal of the leakage detecting line 241.

When the

leakage detection lines

241 and 242 normally operate (are not opened), the resistors R1 and R4 are set, the point B is limited to a lower potential, the silicon controlled rectifier SCR is not triggered, and the LCDI is connected to the output power supply to normally operate. When any position on the leakage detection lines 241 and/or 242 is open or broken, a current path from the N line-D1-R1-R2-R3-D3-SOL to the L line is formed. The voltage at the end of the resistor R3 rises to trigger the conduction of the silicon controlled rectifier SCR to form a current loop of an L line-SOL-D4-SCR-D2-N line, and the SOL generates a magnetic field to enable the RESET switch RESET to be tripped and cut off a power supply.

In this embodiment, the working principle of the testing module 145 is the same as that of the testing module in the ninth embodiment, and the functions are the same and are not described herein again.

It should be understood that in the embodiments of the present invention set forth above, only one SCR is shown, and in other embodiments, a plurality of SCR's connected in parallel may be included in the circuit. And the SCR can be replaced by other semiconductor elements with the same function, such as MOS (metal oxide semiconductor) tubes, triodes and the like.

Through implementing the utility model discloses a power cord leakage current detection device can have the automatic cutout power when opening a way the condition in the leakage detection line to the security of product has been promoted.

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 invention, 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 invention.

Claims

1. An intelligent power line leakage current detection device, comprising:

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

the leakage detection module comprises a first leakage detection line and a second leakage detection line which are connected in series and are respectively used for detecting whether leakage current signals exist in the first power supply line and the second power supply line;

a detection monitoring module, which is connected in series with the first leakage detection line and the second leakage detection line and then coupled to the first power supply line and the second power supply line, for detecting whether there is an open-circuit fault signal in the first leakage detection line and the second leakage detection line; and

a drive module coupled to the switch module, the leakage detection module, and the detection monitoring module, and configured to receive the leakage current signal and/or the open-circuit fault signal to drive the switch module to disconnect the power connection.

2. The intelligent power line leakage current detection device of claim 1, wherein the detection monitoring module comprises at least one resistor and/or at least one diode.

3. The intelligent power line leakage current detection device of claim 2, wherein said detection monitoring module comprises a first diode, a first resistor, a second diode and a second resistor, a first pole of said first diode being connected to a first end of said first resistor and a second pole of said first diode being connected to one of said first supply line and said second supply line, a second end of said first resistor being connected to said first leakage detection line, a first pole of said second diode being connected to the other of said second supply line and said first supply line, a second pole of said second diode being connected to a first end of said second resistor and a second end of said second resistor being coupled to said second leakage detection line.

4. The intelligent power line leakage current detection device of claim 2, wherein the detection monitoring module comprises a first resistor, a second resistor and a first diode.

5. The intelligent power line leakage current detection device of claim 4, wherein said first diode is a common diode for said driving module and said detection monitoring module.

6. The intelligent power line leakage current detection device of claim 5, wherein a first end of said first resistor is coupled to one of said first power supply line and said second power supply line via said first diode and said drive module, and a second end of said first resistor is connected to said first leakage detection line, said second resistor being coupled between the other of said first power supply line and said second leakage detection line.

7. The intelligent power line leakage current detection device of claim 5, wherein a first end of said first resistor is coupled to one of said first power supply line and said second power supply line via said first diode, a second end of said first resistor is connected to said first leakage detection line, and said second resistor is coupled between the other of said first power supply line and said second leakage detection line via said drive module.

8. The intelligent power line leakage current detection device of claim 5, wherein a first end of said first resistor is coupled to one of said first and second power supply lines via said first diode, and a second end of said first resistor is connected to said first leakage detection line, said second resistor being coupled between the other of said first and second power supply lines and said second leakage detection line.

9. The intelligent power line leakage current detection device of claim 5, wherein the first resistance is coupled between one of the first and second power supply lines and the first leakage detection line, a first end of the second resistance is connected to the other of the first and second power supply lines and a second end of the second resistance is connected to the second leakage detection line and to the first pole of the first diode via a third resistance.

10. The intelligent power line leakage current detection device of claim 4, wherein a first pole of said first diode is connected to a first end of said first resistor, a second pole of said first diode is connected to one of said first power supply line and said second power supply line, a second end of said first resistor is connected to said first leakage detection line, and said second resistor is coupled between the other of said first power supply line and said second leakage detection line.

11. The intelligent power line leakage current detection device of claim 4, wherein said first resistor is coupled between one of said first and second power supply lines and said first leakage detection line, a first pole of said first diode is connected to the other of said first and second power supply lines, a second pole of said first diode is connected to a first end of said second resistor, and a second end of said second resistor is connected to said second leakage detection line.

12. The intelligent power line leakage current detection device of claim 4, wherein said first resistor is coupled between one of said first and second supply lines and said first leakage detection line, a first end of said second resistor is connected to the other of said first and second supply lines, a second end of said second resistor is connected to said second leakage detection line and to a first pole of said first diode, a second pole of said first diode is coupled to said drive module.

13. The intelligent power line leakage current detection device of claim 2, wherein said detection monitoring module comprises a full-wave bridge rectifier, a first resistor and a second resistor, said full-wave bridge rectifier being shared by said detection monitoring module and said drive module.

14. The intelligent power line leakage current detection device of claim 13, wherein a first end of said full-wave bridge rectifier is connected to one of said first and second power lines, a second end of said full-wave bridge rectifier is connected to a first end of said first resistor, a second end of said first resistor is connected to said first leakage detection line, a third end of said full-wave bridge rectifier is coupled to the other of said first and second power lines, a fourth end of said full-wave bridge rectifier is connected to a first end of said second resistor, and a second end of said second resistor is connected to said second leakage detection line.

15. The intelligent power line leakage current detection device of claim 1, further comprising a test module including a test switch coupled to the switch module, the leakage detection module and the detection monitoring module, the drive module driving the switch module to open the power connection when the test switch is closed and the first and second leakage detection lines are operating normally.