CN213521264U

CN213521264U - Intelligent power line leakage current protection device

Info

Publication number: CN213521264U
Application number: CN202021831914.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: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-06-22
Anticipated expiration: 2030-08-28

Abstract

The utility model discloses an intelligent power line leakage current protection device, a serial communication port, include: a switch module; the leakage detection module comprises a first leakage detection line, a second leakage detection line and a signal feedback line, wherein one end of the first leakage detection line and one end of the second leakage detection line which are connected in parallel are respectively connected to the signal feedback line, then are coupled between the first power supply line and the second power supply line, and are respectively used for detecting whether a leakage current signal exists; a detection monitoring module coupled to the leakage detection module and configured to detect whether the first leakage detection line and the second leakage detection line have an open circuit fault signal; and a driving module coupled to the switching module, the detection monitoring module, the leakage detection module, and configured to drive the switching module to disconnect the power connection when receiving the leakage current signal and/or the open fault signal. The utility model discloses a whether realize monitoring electric leakage detection line intact reliability of guaranteeing power cord leakage current detection device.

Description

Intelligent power line leakage current protection device

Technical Field

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

Background

The power line leakage current protector is a safety protector for electric fire, and has the main structure of power line with plug, and the main function of detecting leakage current between live wire and zero line of power line between power supply plug and load electric appliance (such as air conditioner and dehumidifier) and wire protecting layer (shield), cutting off power supply of electric equipment, preventing fire and providing 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.

When L or N leakage detection lines in a power line are broken (open) and do not have a protection function, the conventional power line leakage current protection device can still work normally. There are fire or other potential safety hazards.

Therefore, there is a need for an intelligent power line leakage current protection device capable of effectively detecting a leakage detection line.

SUMMERY OF THE UTILITY MODEL

Based on the above problem, the utility model provides an intelligent power cord leakage current protection device, a serial communication port, 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, a second leakage detection line and a signal feedback line, wherein one end of the first leakage detection line and one end of the second leakage detection line which are connected in parallel are respectively connected to the signal feedback line and then coupled between a first power supply line and a second power supply line, and the first leakage detection line and the second leakage detection line 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, the detection monitoring module configured to detect whether an open circuit fault signal is present in the first leakage detection line and the second leakage detection line; and a driving module coupled to the switching module, the detection monitoring module, the leakage detection module, and configured to drive the switching module to disconnect the power connection when the leakage current signal and/or the open-circuit fault signal is received.

In one embodiment, the detection and monitoring module includes at least three resistors and at least one diode.

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

In one embodiment, the first detection resistor is connected in series with the first leakage detection line and to a first common terminal of the first and second leakage detection lines, the second detection resistor is connected in series with the second leakage detection line and to the first common terminal, the first diode is coupled between the first common terminal and one of the first and/or second power supply lines, a second common terminal of the first and second leakage detection lines is connected to a first terminal of the third detection resistor, a second terminal of the third detection resistor is coupled to the other of the first and second power supply lines via the drive module.

In one embodiment, the first detection resistor is connected in series with the first leakage detection line and is connected to a first common terminal of the first leakage detection line and the second leakage detection line, the second detection resistor is connected in series with the second leakage detection line and to the first common terminal, the first common terminal is coupled to one of the first supply line and/or the second supply line via the first diode, a second common terminal of the first leakage detection line and the second leakage detection line is connected to a first terminal of the third detection resistor, a second end of the third detection resistance is coupled to the other of the first supply line and/or the second supply line via the drive module, the first diode is a shared diode of the detection monitoring module and the driving module.

In one embodiment, the testing module further comprises a testing switch coupled between the first leakage detection line and one of the first power supply line and the second power supply line, and the driving module drives the switching module to disconnect the power connection when the testing switch is closed.

The utility model discloses a whether realize monitoring 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 view of an external structure according to an embodiment of the present invention;

fig. 3A and 3B are cross-sectional structural diagrams of power lines according to embodiments of the present invention;

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

fig. 5 is a schematic diagram of a second 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.

An intelligent power line leakage current protection 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, wherein the first leakage detection line and the second leakage detection line are connected in parallel, then are coupled to a first power supply line and a second power supply line 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, the detection monitoring module configured to detect whether an open circuit fault signal is present in the first leakage detection line and the second leakage detection line; and a driving module coupled to the switching module, the detection monitoring module, the leakage detection module, and configured to drive the switching module to disconnect the power connection when the leakage current signal and/or the open-circuit fault signal is received.

As shown in fig. 2, the smart power line leakage current detection protection device includes a plug portion 1 with a switch unit and an external power line 2, wherein the plug portion 1 is further provided with a TEST switch TEST and a RESET switch RESET. In the embodiment shown in fig. 2, the power supply line 2 comprises a live line (L)21, a neutral line (N)22, a ground line (G)23, leakage detection lines (shield lines) 241 and 242, a signal feedback line 25, an insulating coating 27 and a wire filling (or stuffing) 26, wherein the signal feedback line 25 is a conductor with a separate insulating layer and can be arranged at any position in the power supply line 2. The power cord 2 may have a circular shape as shown in fig. 3A, or may have a flat side-by-side shape as shown in fig. 3B or other shapes that may be machined. It is understood that in other embodiments, only other signal lines may be included in the power supply line 2.

Fig. 4 is a schematic diagram of a first embodiment according to the present invention. As shown in fig. 4, the smart power LINE leakage current detection protection device 100 includes a switch module 11, a leakage detection module 12, a detection monitoring module 13 and a driving module 14, the switch module 11 includes a RESET switch RESET, the switch module 11 is configured to control a power connection between an input terminal LINE and an output terminal LOAD, the leakage detection module 12 includes at least

leakage detection LINEs

241 and 242, the leakage detection LINE 241 and the leakage detection LINE 242 are connected in parallel, the leakage detection LINE 241 and the leakage detection LINE 242 have a common terminal C and a common terminal E, the leakage detection LINE 241 and the leakage detection LINE 242 are respectively used for detecting whether a leakage current signal exists in a power supply LINE L and a power supply LINE N, the detection monitoring module 13 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 13 includes resistors R5A, R5B, R5C and a diode D3, a resistor R5B is connected in series with the leakage detection line 241 and connected to a common terminal E, a resistor R5C is connected in series with the leakage detection line 242 and connected to a common terminal E, the common terminal E is connected to one end of a diode D3, the other end of the diode D3 is connected to the supply line L, and the common terminal C is connected to one end of a resistor R5A via a signal feedback line 25 and coupled to the supply line N. One end of a voltage dividing resistor R2 of the driving module 14 is connected to the signal feedback line 25, the other end of the resistor R5A is connected to the anode of the SCR of the driving module 14 and one end of the solenoid SOL of the driving module 14 and is coupled to the RESET switch RESET of the switching module 11 via the SOL, the driving module 14 further comprises diodes D1 and D2, capacitors C1, R2 and R3, the cathode and the control electrode of the SCR are respectively connected to two ends of the capacitor C1, the capacitor C1 is connected in parallel with the resistor R3, the other end of the resistor R2 is connected to the capacitor C1 and one end connected in parallel with the resistor R3 and to the control electrode of the SCR, the anode of the diode D1 is connected to the cathode of the SCR, and the cathode of the diode D1 is connected to the power supply line L and is connected to the switching.

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

when the power supply line L or N generates leakage current, the leakage current signal passes through the feedback signal line 25, the voltage at two ends of the resistor R3 rises, and the SCR is triggered to be conducted, so that a current loop from the N line → SOL → SCR → D1 to the L line is formed, and the solenoid SOL generates a magnetic field to enable the RESET switch RESET to be tripped, so that the power supply is cut off.

When the loops of the

leakage detection lines

241 and 242 normally operate (are not opened or broken), the point C is limited to a low potential by setting the first detection resistor R5B, the second detection resistor R5C and the third detection resistor R5A, so that the SCR cannot be triggered, the power supply is switched on, the switch connection input end is electrically connected with the output power line, and the device normally operates.

When any position on the loop of the first leakage detecting line 241 is open (broken), a current path from the N line-SOL-R5A-C-242-R5C-D3 to the L line is formed. The voltage at the two ends of the resistor R3 rises to trigger the SCR to be conducted to form a current loop of an N line-SOL-SCR-D1-L, and the SOL generates a magnetic field to enable the RESET switch RESET to be tripped, so that the power supply is cut off.

When any position on the loop of the second leakage detection line 242 is open (broken), a current path from the N line-SOL-R5A-C-241-R5B-D3 to the L line is formed. The voltage at the two ends of the resistor R3 rises to trigger the SCR to be conducted, a current loop from an N line-SOL-SCR-D1 to an 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 addition, fig. 4 also includes that the intelligent power line leakage current detection apparatus 100 further includes a TEST module 15, the TEST module 15 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 11 via the power supply line L, and the other end of the TEST switch TEST is coupled to 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, an analog leakage current TEST loop is formed from the L line through the resistor R4, the TEST switch TEST, the leakage detection line 241, the signal feedback line 25, 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. 4, 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 detection line of the power line is 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.

It should be understood that although it is shown in fig. 4 that the cathodes of D3 and D1 are connected to the supply line L and the upper end of the solenoid is connected to the supply line N, in another embodiment, the D3 and D1 cathodes may be connected to the supply line N when the upper end of the solenoid is connected to the supply line L. It should also be understood that although shown in FIG. 4, detection monitoring module 13 includes only one D3, in another embodiment, detection monitoring module 13 may include a plurality of diodes connected in parallel and then connected to common E. In another implementation, both leakage detection line 241 and leakage detection line 242 may be connected in series with a plurality of resistors. In another embodiment, a plurality of resistors connected in series may be coupled between the signal feedback line 25 and the anode of the silicon controlled SCR. It should also be appreciated that in another embodiment, the leakage detection module may not include a signal feedback line, and common terminal C is connected directly to resistor R5A.

The difference from the implementation shown in fig. 4 is that the detection and monitoring module 13 does not include the diode D3, the detection and monitoring module 13 includes the resistors R5A, R5B, R5C and the diode D1, and the D1 is a common diode for the detection and monitoring module 13 and the driving module 14. The common terminal E of the resistors R5B and R5C is connected to the cathode of the thyristor SCR and is coupled to the supply line L via a diode D1.

The working principle of the embodiment shown in fig. 5 is as follows:

when the loops of the

leakage detection lines

When any position on the loop of the first leakage detecting line 241 is open (broken), a current path from the N line SOL-R5A-C-242-R5C-D1 to the L line is formed. The voltage at the two ends of the resistor R3 rises to trigger the SCR to be conducted, a current loop from an N line-SOL-SCR-D1 to an 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.

When any position on the loop of the second leakage detection line 242 is open (broken), a current path from the N line SOL-R5A-C-241-R5B-D1 to the L line is formed. The voltage at the two ends of the resistor R3 rises to trigger the SCR to be conducted, a current loop from an N line-SOL-SCR-D1 to an 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.

The working principle and function of the test module in fig. 5 are the same as those of the test module in fig. 4, and are not repeated herein.

Through the utility model discloses an intelligent power cord leakage current protection device can realize monitoring the leakage detection circuit, has promoted the security. Additionally, the utility model discloses still have circuit structure simple, advantage such as with low costs.

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 protection 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, a second leakage detection line and a signal feedback line, wherein one end of the first leakage detection line and one end of the second leakage detection line which are connected in parallel are respectively connected to the signal feedback line and then coupled between a first power supply line and a second power supply line, and the first leakage detection line and the second leakage detection line 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, the detection monitoring module configured to detect whether an open circuit fault signal is present in the first leakage detection line and the second leakage detection line; and

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

2. The intelligent power line leakage current protection device of claim 1, wherein said detection monitoring module comprises at least three resistors and at least one diode.

3. The intelligent power line leakage current protection device as claimed in claim 1, wherein said detection monitoring module comprises a first detection resistor, a second detection resistor, a third detection resistor and a first diode.

4. The smart power line leakage current protection device of claim 3, wherein said first detection resistor is connected in series with said first leakage detection line and to a first common terminal of said first and second leakage detection lines, said second detection resistor is connected in series with said second leakage detection line and to said first common terminal, said first diode is coupled between said first common terminal and one of said first and/or second power supply lines, a second common terminal of said first and second leakage detection lines is connected to a first terminal of said third detection resistor, a second terminal of said third detection resistor is coupled to the other of said first and second power supply lines via said drive module.

5. The smart power line leakage current protection device of claim 3, wherein said first detection resistor is connected in series with said first leakage detection line and to a first common terminal of said first leakage detection line and said second leakage detection line, said second detection resistor is connected in series with said second leakage detection line and to said first common terminal, said first common terminal is coupled to one of said first supply line and/or said second supply line via said first diode, a second common terminal of said first leakage detection line and said second leakage detection line is connected to a first terminal of said third detection resistor, a second terminal of said third detection resistor is coupled to the other of said first supply line and/or said second supply line via said drive module, wherein, the first diode is a shared diode of the detection monitoring module and the driving module.

6. The intelligent power line leakage current protection device of claim 1, further comprising a test module including a test switch coupled between the first leakage detection line and one of the first and second power supply lines, the drive module driving the switch module to disconnect the power connection when the test switch is closed.