CN211556847U - Leakage protector - Google Patents
Leakage protector Download PDFInfo
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- CN211556847U CN211556847U CN201921803896.1U CN201921803896U CN211556847U CN 211556847 U CN211556847 U CN 211556847U CN 201921803896 U CN201921803896 U CN 201921803896U CN 211556847 U CN211556847 U CN 211556847U
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Abstract
An earth leakage protection device comprising: the switch module is used for controlling the electric connection between the input end and the output end; the leakage detection module comprises a leakage detection line and is used for detecting whether a leakage current signal exists on the first power supply line and/or the second power supply line; an automatic detection module configured to detect whether the leakage detection line is open; a driving module configured to disconnect the switching module to disconnect the power connection when the leakage current signal is detected or the leakage detection line is detected to be open; wherein, the automated inspection module includes: a relay, the relay comprising: a first coil; a first switch; and a first diode; wherein, first switch is normally open switch, and when the electric leakage detection line was opened a way, first coil lost electricity for first switch is closed, thereby makes the disconnection of drive module control switch module. Through the utility model discloses a leakage protection device, the homoenergetic cuts off the power supply when power cord electric leakage and electric leakage detection line open a way, ensures safety better.
Description
Technical Field
The utility model relates to an electric field especially relates to an earth leakage protection device.
Background
A power line leakage protection device (LCDI) is an electric fire safety protection device, the main structure of which is a power line with a plug, and the main function of the device is to detect leakage current between a live wire, a zero line and the like in the power line between a power supply plug and a load electrical appliance (such as a mobile air conditioner) and a lead protection layer (leakage detection line), cut off the power supply of the electric appliance, prevent the generation of fire and 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.
However, the LCDI products in the current market have the following defects that when a leakage detection line in a power line is opened or disconnected and does not have a leakage detection function, the products can still normally work and potential safety hazards exist.
Therefore, there is a need for a power line leakage protection device that can automatically detect a power line leakage condition and the leakage detection line itself.
SUMMERY OF THE UTILITY MODEL
Based on the above problem, the utility model provides an aspect provides an earth leakage protection device, a serial communication port, include: a switch module coupled between an input and an output of a trunk line for controlling a power connection between the input and the output; a leakage detection module comprising a leakage detection line for detecting whether a leakage current signal is present on the first power supply line and/or the second power supply line; an automatic detection module configured to detect whether the leakage detection line is open; a drive module coupled to the switch module, the first and second power supply lines, and the automatic detection module, configured to disconnect the switch module to disconnect the power connection when the leakage detection line detects the leakage current signal or the automatic detection module detects the leakage detection line is open; wherein the automatic detection module comprises: a relay, the relay comprising: a first coil coupled between a first end of the leakage detection line and the second supply line; a first switch coupled between the first supply line and the drive module; and a first diode coupled between a second end of the leakage detection line and the first supply line; the first switch is a normally open switch, and when the leakage detection line is open, the first coil loses power, so that the first switch is closed, and the driving module controls the switch module to be switched off.
In one embodiment, the drive module comprises: a first solenoid coupled with the switch module; and a first semiconductor element, the first switch coupled with a control pole of the first semiconductor element and the first semiconductor element coupled with the first solenoid; and wherein when the leakage detection line detects the leakage current signal, the leakage detection module triggers the first semiconductor element to conduct through the control electrode, so that the first solenoid generates a magnetic field, thereby turning off the switch module; or when the relay detects that the leakage detection line is open, the first coil loses power to close the first switch, so that the control electrode triggers the first semiconductor element to be conducted, and the switch module is disconnected.
In one embodiment, the drive module comprises: at least two solenoids connected in parallel, each coupled with the switch module; and at least two semiconductor elements connected in parallel, the control poles of the at least two semiconductor elements each being coupled with the first switch, and the at least two semiconductor elements being coupled with the at least two solenoids; and wherein when the leakage detection line detects the leakage current signal, the leakage detection module triggers the at least one semiconductor element to conduct through a control pole of the at least one of the at least two semiconductor elements, such that the at least one of the at least two solenoids generates a magnetic field, thereby opening the switching module; or when the relay detects that the leakage detection line is open, the first coil loses power to close the first switch, so that the at least one semiconductor element is triggered to be conducted through the control electrode of the at least one semiconductor element, and the switch module is opened.
In one embodiment, the automatic detection module further comprises a signal feedback line coupled between the second end of the leakage detection line and the first diode, wherein when the relay detects that the signal feedback line is open, the first coil is de-energized such that the first switch is closed, thereby causing the drive module to control the switch module to open to disconnect the power connection.
In one embodiment, the signal feedback line is a conductor with a separate insulating layer.
In one embodiment, the test module further comprises a test switch, and the test switch is coupled between the first supply line and the control pole of the first semiconductor element, wherein when the test switch is closed, the first semiconductor element is triggered to conduct by the control pole of the first semiconductor element, so that the switch module is opened.
In one embodiment, the test module further comprises a test switch, and the test switch is coupled between the first supply line and the control poles of the at least two semiconductor elements, wherein when the test switch is closed, the at least one semiconductor element is triggered to conduct by the control pole of at least one of the at least two semiconductor elements, thereby turning off the switch module.
In one embodiment, the first semiconductor element or the at least two semiconductor elements are any one of a thyristor, a MOS transistor, or a triode.
In one embodiment, the testing device further comprises a housing for accommodating at least one of the switch module, the electrical leakage detection module, the automatic detection module, the driving module and the testing module.
Through the disclosed earth leakage protection device of this embodiment, the homoenergetic cuts off the power supply when power cord electric leakage and electric leakage detection line are opened a way, plays guarantee safety better, simultaneously the utility model has the advantages of simple structure, low cost, easy to produce.
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 shows a schematic structural diagram of an external appearance of an earth leakage protection device according to an embodiment of the present invention;
fig. 2 shows a schematic circuit diagram of a first embodiment of an earth leakage protection device according to the present disclosure;
fig. 3 shows a schematic circuit diagram of a second embodiment of the earth leakage protection device according to the present disclosure.
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.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. For the connection between the units in the drawings, for convenience of description only, it means that at least the units at both ends of the connection are in communication with each other, and is not intended to limit the inability of communication between the units that are not connected.
Fig. 1 is a schematic diagram of an external structure of an earth leakage protection device according to an embodiment of the present invention, as shown in fig. 1, the earth leakage protection device includes a plug portion 1 having a switch module REST and an external power line 2, wherein the plug portion 1 is further provided with a TEST switch TEST. In fig. 1, the power supply line 2 includes a live line (L)21, a neutral line (N)22, a ground line (G)23, a leakage detection line (shield line) 24, an insulating sheath 27, and a signal feedback line 25, wherein the signal feedback line 25 is a conductor with a separate insulating layer and can be disposed at any position in the power supply line 2. Live wire 21, zero line 22 and ground wire 23 cladding respectively have the insulating layer, and electric leakage detection line 24 wraps the insulating layer of live wire 21 and zero line 22 at least, and it should be understood that power cord 2 can include more power supply lines (current-carrying heart yearns), and electric leakage detection line 24 can wrap up many power supply lines simultaneously. It should be understood that the power cord 2 may have a circular or side-by-side flat shape or other finished shape. It will be appreciated that in other embodiments, other signal lines may also be included in the power supply line 2. The leakage detection wire 24 may be a braided structure of metal (e.g., copper, aluminum, etc.), a wound structure of at least one metal wire, a metal foil-clad structure, or a combination of any of these structures.
Fig. 2 shows a schematic circuit diagram of a first embodiment of the earth leakage protection device according to the present disclosure. Wherein the embodiment shown in fig. 2 does not comprise a signal feedback line 25. As shown in fig. 2, the present invention discloses an earth leakage protection device, comprising a switch module RESET, an earth leakage detection module 11, an automatic detection module 12 and a driving module 13, wherein the switch module RESET is coupled between an input LINE and an output LOAD of a trunk LINE for controlling an electric power connection between the input LINE and the output LOAD, the earth leakage detection module 11 comprises an earth leakage detection LINE 24, the earth leakage detection LINE 24 is disposed outside an insulation layer of a live LINE L (first power supply LINE) and a neutral LINE N (second power supply LINE) for detecting whether there is an earth leakage current signal for the first power supply LINE and/or the second power supply LINE, the automatic detection module 12 is coupled with the earth leakage detection LINE 24, the automatic detection module 12 is configured to detect whether the earth leakage detection LINE 24 is open-circuited, and the driving module 13 is coupled to the switch module RESET, the first power supply LINE, the second power supply LINE and the automatic detection module 12, the driving module 13 is configured to cause the switching module RESET to open to disconnect the power connection between the input terminal LINE and the output terminal LOAD when the leakage detection LINE 24 detects a leakage current signal or the automatic detection module 13 detects an open circuit of the leakage detection LINE 24.
More specifically, as shown in fig. 2, the driving module 13 includes a solenoid SOL and a silicon controlled rectifier SCR, one end of the solenoid SOL is coupled to the neutral line N and to the live line L through a thermistor MOV1 and to the switching module RESET, the other end is coupled to the anode of the SCR, the cathode of the SCR is coupled to the live line L via a diode D1, the anode of a diode D2 is connected to the cathode of the SCR, the cathode of a diode D2 is connected to the anode of the SCR so that the D2 is connected in parallel with the SCR, a capacitor C1 and a resistor R3 are coupled between the control electrode and the cathode of the SCR and the C1 is connected in parallel with the R3, the automatic detection module 12 includes a relay KA1 and a diode Dk, the relay KA1 includes a coil (i.e., a first coil) and a contact switch K1 (i.e., a first switch), one end of the coil of the relay KA1 is connected to the neutral line N, the other end is connected to one end of the leakage detection line, the L-Dk-leakage detection line 24-KA1-N forms a loop, or one end of the relay KA1 is connected with the live wire L, and the other end of the relay KA1 is connected with the zero wire through the diode Dk, so that the N-Dk-leakage detection line 24-KA1-L forms a loop. In addition, the contact switch K1 of KA1 is coupled between the live line L and the control electrode of the SCR via a resistor Rk, or is coupled between the neutral line N and the control electrode of the SCR via a resistor Rk. In addition, the earth leakage protection device further includes a testing module 14, the testing module 14 includes a resistor R4 and a testing switch TEST, and the fire line L is coupled to the control electrode of the SCR through the resistor R4, the testing switch TEST, and R2.
The working principle of the present embodiment is explained below.
And pressing down the switch module RESET to switch on the output power supply.
When a live wire L in the power line 2 generates leakage current and is detected by a leakage detection line 24 covered outside an L insulating layer, the L-leakage detection line 24-R2-R3-D2-SOL-neutral wire N forms a loop, C1 is charged through resistors R2 and R3 to trigger the SCR to be conducted, the neutral wire N-SOL-SCR-D1-L forms a loop, the SOL generates a magnetic field, RESET tripping is driven, and the power supply is cut off.
When the neutral line N in the power line 2 generates leakage current and is detected by the leakage detection line covered outside the N insulating layer, the N-leakage detection line 24-R2-R3-D1-L forms a loop, C1 is charged through the resistors R2 and R3 to trigger the SCR to be conducted, the neutral line N-SOL-SCR-D1-L is promoted to form a loop, the SOL generates a magnetic field, the RESET is driven to trip, and the power supply is cut off.
When the switch module RESET is pressed down and the output power supply is connected, the coil-N of the L-DK-leakage detection line 24-KA1 forms a current loop, the coil of the relay KA1 works, the contact switch K1 is switched off, and the load works normally under the condition that the power line has no leakage.
When the leakage detection line 24 is in open circuit or open circuit, a current loop formed by a coil-N of the L-DK-leakage detection line 24-KA1 is disconnected, the coil of the repeater KA1 loses power, the contact switch K1 is closed, the L-K1-RK-R3-D2-SOL-N is enabled to form a loop (or the N-K1-RK-R3-D1-L forms a loop), the C1 is charged through resistors Rk and R3, the SCR is triggered to be conducted, the neutral line N-SOL-SCR-D1-L is enabled to form a loop, the SOL generates a magnetic field, RESET tripping is driven, a power supply is cut off, and safety is guaranteed.
Through the disclosed earth leakage protection device of this embodiment, the homoenergetic cuts off the power when power cord electric leakage and leakage detection line open a way, plays and guarantees safety better.
The difference between fig. 3 and fig. 2 is that fig. 3 provides a separate signal feedback line 25 in the power supply line 2, the signal feedback line 25 is coupled between the leakage detection line 24 and the diode Dk, i.e. the leakage detection line is coupled to the live line L via the signal feedback line 25 and the diode Dk, and the introduction of the signal feedback line 25 enables the electronic components, such as Dk, originally provided at the output to be introduced into the housing of the leakage protection device, thereby improving the aesthetic appearance and facilitating the production process. Meanwhile, the self-checking module can also detect the condition of open circuit or open circuit of the added signal feedback line 25 by the same principle of detecting the condition of open circuit or open circuit of the leakage detection line 24, when the signal feedback line 25 is open circuit or open circuit, the SCR is triggered to be conducted, the neutral line N-SOL-SCR-D1-L is promoted to form a loop, the SOL generates a magnetic field, the RESET is driven to trip, the power supply is cut off, and the safety is ensured.
It should be understood that, in another embodiment, the SCR may be replaced by other semiconductor elements having similar functions, such as MOS transistors or triodes, and may include two or more semiconductor elements that are connected in parallel, and connected to other elements in the same manner as the SCR; in another implementation, multiple solenoids may be included, which form a parallel connection.
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 (10)
1. An earth leakage protection device, comprising:
a switch module coupled between an input and an output of a trunk line for controlling a power connection between the input and the output;
the leakage detection module comprises a leakage detection line and is used for detecting whether a leakage current signal exists on the first power supply line and/or the second power supply line;
an automatic detection module configured to detect whether the leakage detection line is open;
a drive module coupled to the switch module, the first and second power supply lines, and the automatic detection module, configured to disconnect the switch module to disconnect the power connection when the leakage detection line detects the leakage current signal or the automatic detection module detects the leakage detection line is open;
wherein the automatic detection module comprises:
a relay, the relay comprising:
a first coil coupled between a first end of the leakage detection line and the second supply line;
a first switch coupled between the first supply line and the drive module; and
a first diode coupled between a second end of the leakage detection line and the first supply line;
the first switch is a normally open switch, and when the leakage detection line is open, the first coil loses power, so that the first switch is closed, and the driving module controls the switch module to be switched off.
2. A residual current device as claimed in claim 1, characterized in that said driving module comprises:
a first solenoid coupled with the switch module; and
a first semiconductor element, the first switch coupled with a control pole of the first semiconductor element and the first semiconductor element coupled with the first solenoid; and wherein the one or more of the one,
when the leakage current signal is detected by the leakage current detection line, the leakage current detection module triggers the first semiconductor element to be conducted through the control electrode, so that the first solenoid generates a magnetic field, and the switch module is switched off; or
When the relay detects that the leakage detection line is open-circuited, the first coil loses power to close the first switch, so that the control electrode triggers the first semiconductor element to be conducted, and the switch module is disconnected.
3. A residual current device as claimed in claim 1, characterized in that said driving module comprises:
at least two solenoids connected in parallel, each coupled with the switch module; and
at least two semiconductor elements connected in parallel, the control poles of the at least two semiconductor elements each being coupled with the first switch, and the at least two semiconductor elements being coupled with the at least two solenoids; and wherein the one or more of the one,
when the leakage current signal is detected by the leakage detection line, the leakage detection module triggers the at least one semiconductor element to be conducted through a control electrode of the at least one semiconductor element of the at least two semiconductor elements, so that at least one solenoid of the at least two solenoids generates a magnetic field, and the switch module is turned off; or
When the relay detects that the leakage detection line is open, the first coil loses power to close the first switch, so that the at least one semiconductor element is triggered to be conducted through the control electrode of the at least one semiconductor element, and the switch module is opened.
4. The earth leakage protection device of claim 1, wherein the automatic detection module further comprises a signal feedback line coupled between the second end of the leakage detection line and the first diode, wherein when the relay detects an open circuit of the signal feedback line, the first coil is de-energized such that the first switch is closed, thereby causing the drive module to control the switch module to open to disconnect the power connection.
5. A residual current device according to claim 4, characterized in that said signal feedback line is a conductor with a separate insulating layer.
6. A residual current device according to claim 2, characterized in that it further comprises a test module comprising a test switch and in that said test switch is coupled between said first supply line and the control pole of said first semiconductor element,
when the test switch is closed, the control electrode of the first semiconductor element triggers the first semiconductor element to be conducted, so that the switch module is switched off.
7. A residual current device according to claim 3, characterized in that it further comprises a test module comprising a test switch and in that said test switch is coupled between said first supply line and the control electrodes of said at least two semiconductor elements,
when the test switch is closed, the control electrode of at least one semiconductor element in the at least two semiconductor elements triggers the at least one semiconductor element to be conducted, so that the switch module is switched off.
8. A leakage protection device according to claim 2, wherein said first semiconductor element is any one of a thyristor, a MOS transistor or a triode.
9. A residual current device according to claim 3, characterized in that said at least two semiconductor devices are any one of thyristors, MOS transistors or triodes.
10. A residual current device according to claim 7, characterized by further comprising a housing for accommodating at least one of said switch module, said residual current detection module, said automatic detection module, said drive module and said test module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921803896.1U CN211556847U (en) | 2019-10-25 | 2019-10-25 | Leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921803896.1U CN211556847U (en) | 2019-10-25 | 2019-10-25 | Leakage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211556847U true CN211556847U (en) | 2020-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921803896.1U Active CN211556847U (en) | 2019-10-25 | 2019-10-25 | Leakage protector |
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|---|---|
| CN (1) | CN211556847U (en) |
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- 2019-10-25 CN CN201921803896.1U patent/CN211556847U/en active Active
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