CN220711105U - Detection protection device for power line, electric connection equipment and electric equipment - Google Patents
Detection protection device for power line, electric connection equipment and electric equipment Download PDFInfo
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- CN220711105U CN220711105U CN202322372501.XU CN202322372501U CN220711105U CN 220711105 U CN220711105 U CN 220711105U CN 202322372501 U CN202322372501 U CN 202322372501U CN 220711105 U CN220711105 U CN 220711105U
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Abstract
The utility model discloses a detection protection device of a power line, electric connection equipment and electric equipment, wherein the detection protection device comprises a switch module, a leakage current detection line, an open circuit detection module and a driving module, and the leakage current detection line covers a current carrying line in the power line; the open circuit detection module comprises a first lead, a first resistor and a first switching tube, wherein the first lead is connected with the leakage current detection line to form a detection loop, the first resistor is connected with the detection loop in parallel, and the first resistor is also connected to a control pin of the first switching tube so as to control the first switching tube to be conducted under the condition that the detection loop is open; the driving module is connected with the switch module, the leakage current detection line and the first switch tube and used for controlling the switch module to disconnect power connection under the condition that the leakage current detection line detects leakage current or the first switch tube is conducted; the leakage condition of the current line of the power line and the disconnection condition of the leakage current detection line of the power line can be effectively detected.
Description
Technical Field
The utility model relates to the field of electricity, in particular to a detection protection device for a power line, electric connection equipment and electric equipment.
Background
The leakage current detection circuit breaker is a power supply connection device for an electric appliance, can detect leakage current of a power line group through a leakage current detection line, and cuts off power supply connection of the electric appliance when a certain leakage current is detected, so that use safety is ensured.
In the existing leakage current detection circuit breaker, when a leakage current detection line of a live wire or a zero line in a power line is broken, an electric appliance can still supply power and output, and at the moment, the electric appliance may have potential safety hazards, but the leakage current detection circuit breaker of the related technology cannot reflect the situation of the leakage current detection line.
Disclosure of Invention
The utility model aims to at least solve one of the technical problems in the prior art, and provides a detection protection device, electric connection equipment and electric equipment for a power line, which can effectively detect the current leakage condition of a current carrying line of the power line and the disconnection condition of a leakage current detection line of the power line.
In a first aspect, an embodiment of the present utility model provides a detection protection device for a power line, including a switch module, a leakage current detection line, an open circuit detection module, and a driving module, where:
the switch module is used for controlling the electric power connection between the input end and the output end of the power line;
the leakage current detection line is coated on the current carrying line in the power line and is used for detecting whether leakage current exists in the current carrying line or not;
the open circuit detection module comprises a first lead, a first resistor and a first switching tube, wherein the first lead is connected with the leakage current detection line to form a detection loop, the first resistor is connected with the detection loop in parallel, and the first resistor is also connected to a control pin of the first switching tube so as to control the first switching tube to be conducted under the condition that the detection loop is open;
the driving module is connected with the switch module, the leakage current detection line and the first switch tube and is used for controlling the switch module to disconnect the power connection under the condition that the leakage current detection line detects leakage current or the first switch tube is conducted.
The detection protection device for the power line provided by the embodiment of the utility model has at least the following beneficial effects: the outside of the current carrying wire of the power line is coated with a leakage current detection wire, when the current carrying wire generates leakage and is detected by the leakage current detection wire, the driving module can control the switch module to disconnect the power connection between the input end and the output end of the power line, so as to realize detection and treatment of the leakage condition; in addition, still be provided with open circuit detection module, wherein first wire and leakage current detection line connection constitution detection loop, detection loop and first resistance are parallelly connected for carry out the short circuit to first resistance when the detection loop does not appear opening the circuit condition, the electric current can not flow through first resistance, and when the detection loop appears opening the circuit condition, the electric current can only flow through first resistance, thereby the control pin state of the first switch tube that makes to be connected with first resistance changes, lead to first switch tube to switch on, and then the power connection between the input and the output of power cord is disconnected by drive module control switch module, realize the detection and the processing to the disconnection condition of detection loop. In addition, the detection protection device for the power line is simple in circuit structure, low in cost and high in safety.
According to some embodiments of the present utility model, the power line includes a first current carrying line and a second current carrying line; the driving module comprises a switch tripping driving unit, the switch tripping driving unit comprises a second switching tube and a coil for generating electromagnetic force for driving the switching module, and the second current line, the coil, the second switching tube and the first current line are sequentially connected to form a tripping control loop when the second switching tube is conducted.
According to the detection protection device provided by some embodiments of the present utility model, the driving module further includes a switching tube driving unit, the switching tube driving unit includes a second resistor and a third resistor connected in series, and the switching trip driving unit further includes a first diode and a second diode; the leakage current detection line is connected to the second resistor, a connection point of the second resistor and the third resistor is connected to a control pin of the second switching tube, and the third resistor is connected to the first current-carrying line through the first diode and to a connection point of the second switching tube and the coil through the second diode.
According to the detection protection device provided by some embodiments of the present utility model, the open circuit detection module further includes a fourth resistor, one end of the fourth resistor is connected to a connection point of the first resistor and the first wire, and the other end of the fourth resistor is connected to a connection point of the second switching tube and the coil.
According to the detection protection device provided by some embodiments of the present utility model, the open circuit detection module further includes a fifth resistor, one end of the fifth resistor is connected to a connection point between the first resistor and the leakage current detection line, and the other end of the fifth resistor is connected to a connection point between the third resistor and the first diode.
According to the detection protection device provided by some embodiments of the present utility model, the open circuit detection module further includes a sixth resistor, and a connection point of the first resistor and the first wire is connected to the control pin of the first switching tube through the sixth resistor.
According to some embodiments of the utility model, the switch tube driving unit further includes a first capacitor connected in parallel with the third resistor.
According to some embodiments of the present utility model, the detection protection device further includes a test switch, one end of the test switch is connected to a connection point of the first resistor and the detection loop, and the other end of the test switch is connected to a connection point of the second switch tube and the coil.
According to some embodiments of the present utility model, the detection protection device further includes an LED indication unit connected in parallel with the second switching tube, where the LED indication unit includes a seventh resistor and a light emitting diode connected in series.
In a second aspect, an embodiment of the present utility model provides an electrical connection device, including a housing, a power cord connected to the housing, and a detection protection device according to the embodiment of the first aspect, where the switch module, the open circuit detection module, and the driving module are disposed in the housing, and the leakage current detection line and the first conductive wire are disposed in the power cord.
According to some embodiments of the present utility model, the power line includes a first current carrying line and a second current carrying line, the leakage current detection line includes a first shielding conductor wrapping the first current carrying line and a second shielding conductor wrapping the second current carrying line, and outer portions of the first shielding conductor and the second shielding conductor are in contact with each other.
According to some embodiments of the present utility model, the leakage current detection line further includes a third shielding conductor that simultaneously wraps the first shielding conductor and the second shielding conductor, and the third shielding conductor is simultaneously in contact with the first shielding conductor and the second shielding conductor.
According to some embodiments of the utility model, the power line includes a first current carrying line and a second current carrying line, and the leakage current detection line includes a third shielding conductor that wraps the first current carrying line and the second current carrying line at the same time.
According to some embodiments of the present utility model, a first insulating layer is disposed between the first current-carrying wire and the first shielding conductor, and a second insulating layer is disposed between the second current-carrying wire and the second shielding conductor.
In a third aspect, an embodiment of the present utility model provides an electrical apparatus, including a load device and an electrical connection device according to an embodiment of the second aspect, where an output end of the power cord is connected to the load device.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate and do not limit the utility model.
The utility model is further described below with reference to the drawings and examples;
fig. 1 is a schematic circuit diagram of a detection protection device for a power line according to an embodiment of the present utility model;
FIG. 2 is a schematic block diagram of a detection protection device for a power line according to an embodiment of the present utility model;
fig. 3 is an external schematic view of an electrical connection device according to an embodiment of the present utility model;
FIG. 4 is a schematic cross-sectional view of a power cord provided in accordance with one embodiment of the present utility model;
FIG. 5 is a schematic cross-sectional view of a power cord according to another embodiment of the present utility model;
fig. 6 is a schematic cross-sectional view of a power cord according to yet another embodiment of the present utility model.
Detailed Description
Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.
In the description of the embodiments of the present utility model, the meaning of several is one or more, the meaning of several is two or more, greater than, less than, exceeding, etc. are understood to exclude the present number, the above, below, within, etc. are understood to include the present number, and "at least one" means one or more, and "at least one item below" and the like, means any combination of these items, including any combination of single items or plural items. If any, the terms "first," "second," etc. are used for distinguishing between technical features only, and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
It should be noted that, in the embodiments of the present utility model, terms such as setting, installing, connecting and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the foregoing terms in the embodiments of the present utility model in combination with the specific content of the technical solution. For example, the term "coupled" may be a mechanical connection, an electrical connection, or may be in communication with one another; can be directly connected or indirectly connected through an intermediate medium.
The technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
The utility model provides a leakage detection protection device of power cord (abbreviated as "LCDI device" below) is a kind of safety protection device of using electric fire, and its main structure is the power cord with plug, and the main function is to detect that the power plug takes place leakage current to between the wire live wire of power cord, zero line etc. and the wire inoxidizing coating (shielding) between the load electrical apparatus (for example air conditioner, dehumidifier) to cut off the consumer power, prevent the production of conflagration, in order to provide safety protection. Accordingly, the LCDI device can prevent arc fault fires caused by damage to the power line, a decrease in insulation strength, and the like due to live (L line), neutral (N line), ground wire aging, wear, extrusion, or animal biting among the power lines. In the existing LCDI device, when the leakage current detection line of the live wire or the zero wire in the power line does not have a protection function due to open circuit or broken circuit, the product can still supply power and output, so that fire or other potential safety hazards exist. Therefore, there is a need for a power line leakage detection protection device capable of detecting a leakage current detection line.
Based on the above, the embodiment of the utility model provides a detection protection device, an electric connection device and electric equipment for a power line, which can effectively detect the current leakage condition of a current carrying line of the power line and the disconnection condition of a leakage current detection line of the power line; in addition, the detection protection device for the power line is simple in circuit structure, low in cost and high in safety.
Embodiments of the present utility model will be further described below with reference to the accompanying drawings.
Fig. 1 is a schematic circuit diagram of a detection protection device for a power line according to an embodiment of the present utility model; fig. 2 is a schematic block diagram of a detection protection device for a power line according to an embodiment of the present utility model.
Referring to fig. 1 and 2, an embodiment of a first aspect of the present utility model provides a detection protection device for a power line, including a switch module 100, a leakage current detection line 200, an open circuit detection module 300, and a driving module 400, wherein:
the switch module 100 is used for controlling the electric power connection between the input end and the output end of the power line; in general, the power line includes a first current-carrying line L as a live line and a second current-carrying line N as a neutral line; if the power line supplies power to electric equipment using three-phase alternating current, the power line can further comprise a third current carrying line and a fourth current carrying line which are used as live lines; in addition, when the ground line needs to be configured, the power supply line may further include a fifth current carrying line as the ground line. In the following, a description will be given by taking an example in which the power supply line includes a first current line L and a second current line N.
The leakage current detection line 200 is wrapped around the current carrying line in the power line and is used for detecting whether leakage current exists in the current carrying line; it can be understood that the leakage current detection line 200 is wrapped outside the current carrying line of the power line, and when the leakage current of the current carrying line is detected by the leakage current detection line 200, the driving module 400 can control the switch module 100 to disconnect the power connection between the input end and the output end of the power line, so as to realize detection and treatment of the leakage current.
The open circuit detection module 300 comprises a first lead 310, a first resistor R1 and a first switching tube Q1, wherein the first lead 310 is connected with the leakage current detection line 200 to form a detection loop, the first resistor R1 is connected with the detection loop in parallel, and the first resistor R1 is also connected to a control pin of the first switching tube Q1 so as to control the first switching tube Q1 to be conducted under the condition that the detection loop is open; it can be understood that the open circuit detection module 300 is provided, wherein the first wire 310 is connected with the leakage current detection line 200 to form a detection loop, the detection loop is connected in parallel with the first resistor R1, so that the first resistor R1 is short-circuited when no open circuit condition occurs in the detection loop, current cannot flow through the first resistor R1, and when the open circuit condition occurs in the detection loop, current can only flow through the first resistor R1, so that the control pin state of the first switching tube Q1 connected with the first resistor R1 changes, the first switching tube Q1 is turned on, and the driving module 400 controls the switching module 100 to disconnect the power connection between the input end and the output end of the power line, thereby realizing detection and processing of the disconnection condition of the detection loop.
The driving module 400 is connected to the switching module 100, the leakage current detection line 200, and the first switching tube Q1, and is used to control the switching module 100 to disconnect the power connection when the leakage current detection line 200 detects the leakage current or the first switching tube Q1 is turned on. It should be noted that, in addition to the detection of the disconnection of the leakage current detection line 200, the disconnection of other positions in the detection circuit may be detected. The detection protection device for the power line provided by the embodiment of the utility model can effectively detect the current leakage condition of the current carrying line of the power line and the disconnection condition of the leakage current detection line 200 of the power line.
Referring to fig. 1, in a detection protection device provided in some embodiments of the present utility model, a power line includes a first current carrying line L and a second current carrying line N; the driving module 400 includes a switch trip driving unit 410, and the switch trip driving unit 410 includes a second switching tube Q2 and a coil Lx for generating electromagnetic force for driving the switching module 100, and the second current line N, the coil Lx, the second switching tube Q2, and the first current line L are sequentially connected to form a trip control loop when the second switching tube Q2 is turned on. The first switching transistor Q1 and the second switching transistor Q2 may be any one of thyristors, bipolar transistors, and field effect transistors.
It can be understood that when the leakage current detection line 200 detects that a current line in the power line has leakage current, the leakage current detection line 200 generates a leakage current signal with higher voltage level, and can trigger the second switching tube Q2 to be turned on, so as to form a trip control loop, so that the coil Lx is electrified to generate electromagnetic force to drive the switching module 100 to act, and power connection between the input end and the output end of the power line is cut off; similarly, when the open circuit condition occurs in the detection loop, the control pin state of the first switching tube Q1 changes, so that the first switching tube Q1 is turned on, and then the second switching tube Q2 can be triggered to be turned on, thereby forming a trip control loop, so that the coil Lx is electrified to generate electromagnetic force, the switching module 100 is driven to act, and the power connection between the input end and the output end of the power line is cut off.
Referring to fig. 1, in the detection protection device provided in some embodiments of the present utility model, the driving module 400 further includes a switching tube driving unit 420, the switching tube driving unit 420 includes a second resistor R2 and a third resistor R3 connected in series, and the switching trip driving unit 410 further includes a first diode D1 and a second diode D2; the leakage current detection line 200 is connected to the second resistor R2, a connection point of the second resistor R2 and the third resistor R3 is connected to a control pin of the second switching tube Q2, and the third resistor R3 is connected to the first current carrying line L through the first diode D1 and to a connection point of the second switching tube Q2 and the coil Lx through the second diode D2.
It can be understood that when the leakage current occurs in the first current line L to the leakage current detection line 200, a current loop with a flow direction of the first current line L, the leakage current detection line 200, the second resistor R2, the third resistor R3, the second diode D2, the coil Lx, and the second current line N is formed, so that under the voltage division effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switch tube Q2 is raised to trigger conduction, and a trip control loop with a flow direction of the second current line N, the coil Lx, the second switch tube Q2, the first diode D1, and the first current line L is formed, so that the coil Lx is electrified to generate electromagnetic force to drive the switch module 100 to act, and the power connection between the input end and the output end of the power line is cut off; similarly, when the second current line N has a leakage current to the leakage current detection line 200, a current loop with a flow direction of the second current line N, the leakage current detection line 200, the second resistor R2, the third resistor R3, the first diode D1, and the first current line L is formed, so that under the voltage division effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching tube Q2 is raised to trigger conduction, and a trip control loop with a flow direction of the second current line N, the coil Lx, the second switching tube Q2, the first diode D1, and the first current line L is formed, so that the coil Lx is electrified to generate electromagnetic force to drive the switching module 100 to act, and the power connection between the input end and the output end of the power line is cut off.
Referring to fig. 1, in the detection protection device according to some embodiments of the present utility model, the open circuit detection module 300 further includes a fourth resistor R4, wherein one end of the fourth resistor R4 is connected to a connection point between the first resistor R1 and the first wire 310, and the other end is connected to a connection point between the second switching tube Q2 and the coil Lx.
It can be understood that when the detection loop is not disconnected, the detection loop is connected in parallel with the first resistor R1, so as to short-circuit the first resistor R1, and form a current loop with the directions of the second current-carrying line N, the coil Lx, the fourth resistor R4, the detection loop, the second resistor R2, the third resistor R3, the first diode D1 and the first current-carrying line L, and by reasonably configuring the resistances of the fourth resistor R4, the second resistor R2 and the third resistor R3, the voltage of the control pin of the first switching tube Q1 is low enough to be insufficient to turn on the first switching tube Q1 when the detection loop is not disconnected; when the detection loop is disconnected, a current loop with the second current-carrying line N, the coil Lx, the fourth resistor R4, the first resistor R1, the second resistor R2, the third resistor R3, the first diode D1 and the first current-carrying line L is formed, and under the partial pressure action of the first resistor R1 and the fourth resistor R4, the voltage of the control pin of the first switch tube Q1 is increased to trigger the connection; then, a current loop with the flow direction of the second current carrying line N, the coil Lx, the first switching tube Q1, the second resistor R2, the third resistor R3, the first diode D1 and the first current carrying line L is formed, so that under the partial pressure effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching tube Q2 is increased to trigger conduction, and a tripping control loop with the flow direction of the second current carrying line N, the coil Lx, the second switching tube Q2, the first diode D1 and the first current carrying line L is formed, so that the coil Lx is electrified to generate electromagnetic force to drive the switching module 100 to act, and the power connection between the input end and the output end of the power line is cut off.
Referring to fig. 1, in the detection protection device according to some embodiments of the present utility model, the open circuit detection module 300 further includes a fifth resistor R5, wherein one end of the fifth resistor R5 is connected to a connection point between the first resistor R1 and the leakage current detection line 200, and the other end is connected to a connection point between the third resistor R3 and the first diode D1.
It can be understood that the fifth resistor R5 is provided, and the fifth resistor R5 is equivalent to a branch circuit formed by the second resistor R2 and the third resistor R3 in parallel, so that when the detection circuit is disconnected, a current circuit with the second current-carrying line N, the coil Lx, the fourth resistor R4, the first resistor R1, the fifth resistor R5, the first diode D1 and the first current-carrying line L can be formed instead of the second resistor R2 and the third resistor R3.
Referring to fig. 1, in the detection protection device according to some embodiments of the present utility model, the open circuit detection module 300 further includes a sixth resistor R6, and a connection point between the first resistor R1 and the first wire 310 is connected to a control pin of the first switching tube Q1 through the sixth resistor R6.
It can be appreciated that, by setting the sixth resistor R6 as the input resistor of the control pin of the first switching tube Q1, the first switching tube Q1 is prevented from being damaged due to the larger voltage impact generated by the first wire 310 when the leakage current detection line 200 detects the leakage current of the current line, and the sixth resistor R6 can play a better role in protecting the first switching tube Q1.
Referring to fig. 1, in the detection protection device according to some embodiments of the present utility model, the switching tube driving unit 420 further includes a first capacitor C1 connected in parallel with the third resistor R3. In addition, it can be seen that the detection protection device further comprises a lightning protection unit 700, the lightning protection unit 700 comprising a first varistor ZR1 arranged between the first current line L and the second current line N; the switch trip driving unit 410 further includes a second varistor ZR2 connected in parallel with the second switching tube Q2. It will be appreciated that a varistor is a resistive device with non-linear volt-ampere characteristics, and is primarily used to clamp the voltage when the circuit is subjected to an overvoltage, absorbing excess current to protect sensitive devices.
Referring to fig. 1, in some embodiments of the present utility model, the detection protection device further includes a TEST switch TEST, where one end of the TEST switch TEST is connected to a connection point between the first resistor R1 and the detection circuit, and the other end of the TEST switch TEST is connected to a connection point between the second switching tube Q2 and the coil Lx.
It can be understood that when the TEST switch TEST is pressed, a current loop is formed, which flows to the second current-carrying line N, the coil Lx, the TEST switch TEST, the first wire 310, the leakage current detection line 200, the second resistor R2, the third resistor R3, the first diode D1, and the first current-carrying line L, so that under the voltage division effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switch Q2 is raised to trigger conduction, and a trip control loop is formed, which flows to the second current-carrying line N, the coil Lx, the second switch Q2, the first diode D1, and the first current-carrying line L, so that the coil Lx is energized to generate electromagnetic force to drive the switch module 100 to operate, and the power connection between the input end and the output end of the power line is cut off.
Referring to fig. 1, in the detection protection device provided in some embodiments of the present utility model, an LED indication unit 500 connected in parallel to the second switching tube Q2 is further included, where the LED indication unit 500 includes a seventh resistor R7 and a light emitting diode LED1 connected in series. It can be further seen that the LED indicating unit 500 further includes an eighth resistor R8, a connection point of the second switching tube Q2 and the coil Lx is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the positive electrode of the light emitting diode LED1, the negative electrode of the light emitting diode LED1 is connected to the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected to the first current line L.
It can be understood that when the first switching tube Q1 and the second switching tube Q2 are not turned on, that is, when the detection circuit does not detect the leakage current and the detection circuit does not have an opening, a current circuit is formed, which flows to the second current-carrying line N, the coil Lx, the eighth resistor R8, the seventh resistor R7, the light-emitting diode LED1, the first diode D1, and the first current-carrying line L, and the light-emitting diode LED1 is turned on; when the second switching tube Q2 is turned on, the LED indication unit 700 is correspondingly shorted, the LED1 is no longer turned on, and when the second switching tube Q2 is turned on, the switch module 100 is controlled to be turned on, the power connection between the input end and the output end of the power line is cut off, and the LED1 is also not turned on any more when the power supply is lost.
In the following, in order to more clearly describe the detection protection device for a power cord according to the present utility model, a detailed embodiment of the present application will be described in full detail with reference to fig. 1.
Referring to fig. 1, the power line includes a first current carrying line L as a live line and a second current carrying line N as a neutral line; the detection protection device comprises a switch module 100, a leakage current detection line 200, an open circuit detection module 300, a driving module 400 and a TEST switch TEST, wherein:
the switch module 100 is used for controlling the electric power connection between the input end and the output end of the power line;
the leakage current detection line 200 is wrapped around the current carrying line in the power line and is used for detecting whether leakage current exists in the current carrying line;
the open circuit detection module 300 includes a first conductive line 310, a first resistor R1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a first switching tube Q1;
the driving module 400 includes a switch trip driving unit 410 and a switch tube driving unit 420; the switch trip driving unit 410 includes a coil Lx for generating electromagnetic force for driving the switch module 100, a second switching tube Q2, a first diode D1, and a second diode D2; the switching tube driving unit 420 includes a first capacitor C1, a second resistor R2, and a third resistor R3;
the connection relation between the above elements is specifically as follows:
the end B of the leakage current detection line 200, which is close to the output end, is connected with the end D of the first lead 310, which is close to the output end, so that a detection loop is formed from the end A of the leakage current detection line 200, which is close to the input end, to the end B of the leakage current detection line 200, which is close to the output end, to the end D of the first lead 310, which is close to the output end, and finally to the end C of the first lead 310, which is close to the input end;
one end A of the leakage current detection line 200, which is close to the input end, is respectively connected to one end of the first resistor R1, one switch pin of the first switch tube Q1, one end of the second resistor R2 and one end of the fifth resistor R5;
one end C of the first lead 310 near the input end is respectively connected to the other end of the first resistor R1, one end of the fourth resistor R4, one end of the sixth resistor R6 and one end of the TEST switch TEST; the other end of the sixth resistor R6 is connected to a control pin of the first switching tube Q1;
the other end of the fifth resistor R5 is respectively connected to one end of the third resistor R3, one end of the first capacitor C1, one switch pin of the second switch tube Q2, the anode of the first diode D1 and the anode of the second diode D2; the cathode of the second diode D2 is connected to the first current line L;
the other end of the first capacitor C1, the other end of the second resistor R2 and the other end of the third resistor R3 are connected to a control pin of the second switching tube Q2;
the other end of the TEST switch TEST, the other end of the fourth resistor R4, the other switch pin of the first switch tube Q1, the other switch pin of the second switch tube Q2 and the negative electrode of the second diode D2 are all connected to one end of the coil Lx; the other end of the coil Lx is connected to a second current carrying wire N.
In this embodiment, the situation that the switch module 100 can be triggered to act so as to cut off the power connection between the input end and the output end of the power line mainly includes the following 4 cases:
1. when the leakage current occurs to the leakage current detection line 200, a current loop with the flow direction of the first current line L, the leakage current detection line 200, the second resistor R2, the third resistor R3, the second diode D2, the coil Lx and the second current line N is formed, so that under the partial pressure action of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching tube Q2 is raised to trigger conduction, and a trip control loop with the flow direction of the second current line N, the coil Lx, the second switching tube Q2, the first diode D1 and the first current line L is formed, so that the coil Lx is electrified to generate electromagnetic force to drive the switching module 100 to act, and the power connection between the input end and the output end of the power line is cut off;
2. when the second current line N has leakage current to the leakage current detection line 200, a current loop with the flow direction of the second current line N, the leakage current detection line 200, the second resistor R2, the third resistor R3, the first diode D1 and the first current line L is formed, so that under the voltage division effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching tube Q2 is raised to trigger conduction, and a trip control loop with the flow direction of the second current line N, the coil Lx, the second switching tube Q2, the first diode D1 and the first current line L is formed, so that the coil Lx is electrified to generate electromagnetic force to drive the switching module 100 to act, and the power connection between the input end and the output end of the power line is cut off;
3. when any part of the detection loop is disconnected, a current loop with the flow direction of the second current-carrying line N, the coil Lx, the fourth resistor R4, the first resistor R1, the fifth resistor R5, the first diode D1 and the first current-carrying line L is formed, so that the voltage of the control pin of the first switching tube Q1 is increased to trigger the connection under the action of the voltage division of the fourth resistor R4; then, a current loop with the flow direction of the second current carrying wire N, the coil Lx, the first switching tube Q1, the second resistor R2, the third resistor R3, the first diode D1 and the first current carrying wire L is formed, so that under the partial pressure effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switching tube Q2 is increased to trigger conduction, and a tripping control loop with the flow direction of the second current carrying wire N, the coil Lx, the second switching tube Q2, the first diode D1 and the first current carrying wire L is formed, so that the coil Lx is electrified to generate electromagnetic force to drive the switching module 100 to act, and the power connection between the input end and the output end of the power line is cut off;
4. when the TEST switch TEST is pressed, a current loop with the flow direction of the second current carrying line N, the coil Lx, the TEST switch TEST, the first lead 310, the leakage current detection line 200, the second resistor R2, the third resistor R3, the first diode D1 and the first current carrying line L is formed, so that under the voltage division effect of the second resistor R2 and the third resistor R3, the voltage of the control pin of the second switch tube Q2 is raised to trigger conduction, and a trip control loop with the flow direction of the second current carrying line N, the coil Lx, the second switch tube Q2, the first diode D1 and the first current carrying line L is formed, so that the coil Lx is electrified to generate electromagnetic force to drive the switch module 100 to act, and the power connection between the input end and the output end of the power line is cut off.
The detection protection device for the power line provided by the embodiment of the utility model can effectively detect the current leakage condition of the current carrying line of the power line and the disconnection condition of the leakage current detection line of the power line; in addition, the detection protection device for the power line is simple in circuit structure, low in cost and high in safety.
In addition, referring to fig. 3, a second aspect embodiment of the present utility model provides an electrical connection apparatus 600 including a housing 610, a power line 620 connected to the housing 610, and a detection protection device as in the first aspect embodiment, the switching module 100, the open circuit detection module 300, and the driving module 400 are disposed in the housing 610, and the leakage current detection line 200 and the first conductive line 310 are located in the power line 620.
Referring to fig. 4, fig. 4 is a schematic cross-sectional view of a power cord 620 according to an embodiment of the present utility model. In the electrical connection device 600 provided in some embodiments of the present utility model, the power line 620 includes a first current carrying line L and a second current carrying line N, and the leakage current detection line 200 includes a first shielding conductor 621 surrounding the first current carrying line L and a second shielding conductor 622 surrounding the second current carrying line N, and the outer portions of the first shielding conductor 621 and the second shielding conductor 622 are in contact with each other.
It is to be understood that in the embodiment shown in fig. 4, the leakage current detection line 200 is formed by the first shielding conductor 621 and the second shielding conductor 622 that are in contact with each other, that is, there are two shielding conductors that detect the leakage currents of the first current line L and the second current line N, respectively, and in this case, the disconnection condition of the leakage current detection line 200 refers to the condition that both the first shielding conductor 621 and the second shielding conductor 622 are disconnected.
Referring to fig. 5, in an electrical connection device 600 according to another embodiment of the present utility model, the leakage current detection line 200 includes, in addition to a first shielding conductor 621 surrounding the first current line L and a second shielding conductor 622 surrounding the second current line N, a third shielding conductor 623 surrounding both the first shielding conductor 621 and the second shielding conductor 622, and the third shielding conductor 623 is in contact with both the first shielding conductor 621 and the second shielding conductor 622.
It is to be understood that, in the embodiment shown in fig. 5, the leakage current detection line 200 is formed by the first shielding conductor 621, the second shielding conductor 622 and the third shielding conductor 623 contacting each other two by two, and in this case, the disconnection of the leakage current detection line 200 refers to the disconnection of the first shielding conductor 621, the second shielding conductor 622 and the third shielding conductor 623.
Referring to fig. 6, in an electrical connection device 600 provided in a further embodiment of the present utility model, a power line 620 includes a first current carrying line L and a second current carrying line N, and a leakage current detection line 200 includes a third shielding conductor 623 surrounding both the first current carrying line L and the second current carrying line N.
It will be appreciated that in the embodiment shown in fig. 6, the leakage current detection line 200 is formed by one larger third shield conductor 623, in the event of a disconnection of the leakage current detection line 200, in the event of a disconnection of the third shield conductor 623.
Referring to fig. 4, 5 or 6, in the electrical connection device 600 provided in some embodiments of the present utility model, a first insulating layer 624 is disposed between the first current line L and the first shielding conductor 621, and a second insulating layer 625 is disposed between the second current line N and the second shielding conductor 622.
In addition, it can be seen that the power line 620 further includes an outer insulating layer 626, and the outer insulating layer 626 simultaneously encapsulates the first current carrying line L, the second current carrying line N, the leakage current detecting line 200, and the first conductive line 310; the outer insulation layer 626 may also be provided inside with a third carrier flow line PE, and both the third carrier flow line PE and the first wire 310 may be provided with separate insulation layers.
It is understood that the manner in which the first shielding conductor 621, the second shielding conductor 622, and the third shielding conductor 623 are wrapped includes, but is not limited to, winding a spiral, braiding a mesh, hollow ring; the leakage current detection line 200 may be a metal, for example, may include, but is not limited to, gold, silver, copper, iron, aluminum, alloys, etc.; leakage current detection line 200 may also be a semiconductor material, which may include, but is not limited to, carbon, silicon, germanium, graphene, etc.; the shape of the leakage current detection line 200 includes, but is not limited to, a mesh shape formed by braiding a plurality of thin strips, two hollow circles or irregular shapes surrounded by a thin sheet, a single strip-wound hollow circle or irregular shape, as long as the shapes can completely cover the first current carrying line L and the second current carrying line N. The cross-sectional shape of the power cord 620 includes, but is not limited to, circular, square, oval, polygonal, irregular, and the like.
In addition, an embodiment of the third aspect of the present utility model provides a powered device, including a load device and the electrical connection device 600 of the embodiment of the second aspect above, where an output terminal of the power line 620 is connected to the load device.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.
Claims (15)
1. A detection protection device for a power line, comprising:
the switch module is used for controlling the electric power connection between the input end and the output end of the power line;
a leakage current detection line wrapping the current carrying line in the power line and used for detecting whether leakage current exists in the current carrying line or not;
the open circuit detection module comprises a first lead, a first resistor and a first switching tube, wherein the first lead is connected with the leakage current detection line to form a detection loop, the first resistor is connected with the detection loop in parallel, and the first resistor is also connected to a control pin of the first switching tube so as to control the first switching tube to be conducted under the condition that the detection loop is open;
the driving module is connected with the switch module, the leakage current detection line and the first switch tube and used for controlling the switch module to disconnect the power connection under the condition that the leakage current detection line detects leakage current or the first switch tube is conducted.
2. The protection device of claim 1, wherein the power line comprises a first current carrying line and a second current carrying line; the driving module comprises a switch tripping driving unit, the switch tripping driving unit comprises a second switching tube and a coil for generating electromagnetic force for driving the switching module, and the second current line, the coil, the second switching tube and the first current line are sequentially connected to form a tripping control loop when the second switching tube is conducted.
3. The protection device of claim 2, wherein the drive module further comprises a switching tube drive unit comprising a second resistor and a third resistor in series, the switching trip drive unit further comprising a first diode and a second diode; the leakage current detection line is connected to the second resistor, a connection point of the second resistor and the third resistor is connected to a control pin of the second switching tube, and the third resistor is connected to the first current-carrying line through the first diode and to a connection point of the second switching tube and the coil through the second diode.
4. The protection device of claim 3, wherein the open circuit detection module further comprises a fourth resistor, one end of the fourth resistor is connected to a connection point of the first resistor and the first wire, and the other end is connected to a connection point of the second switching tube and the coil.
5. The protection device according to claim 3, wherein the open circuit detection module further comprises a fifth resistor, one end of the fifth resistor is connected to a connection point of the first resistor and the leakage current detection line, and the other end of the fifth resistor is connected to a connection point of the third resistor and the first diode.
6. The protection device of claim 3, wherein the open circuit detection module further comprises a sixth resistor, and wherein a connection point of the first resistor and the first wire is connected to a control pin of the first switching tube through the sixth resistor.
7. A test protection device according to claim 3, wherein the switching tube driving unit further comprises a first capacitor connected in parallel with the third resistor.
8. The test protection device of claim 2, further comprising a test switch having one end connected to a connection point of the first resistor and the test loop and another end connected to a connection point of the second switching tube and the coil.
9. The protection device of claim 2, further comprising an LED indication unit in parallel with the second switching tube, the LED indication unit comprising a seventh resistor and a light emitting diode in series.
10. An electrical connection device comprising a housing, a power cord connected to the housing, and the detection protection device of any one of claims 1 to 9, the switch module, the open circuit detection module, and the drive module being disposed in the housing, the leakage current detection wire and the first wire being located in the power cord.
11. The electrical connection device of claim 10, wherein the power supply line comprises a first current carrying line and a second current carrying line, the leakage current detection line comprises a first shielding conductor surrounding the first current carrying line and a second shielding conductor surrounding the second current carrying line, and the outer portions of the first shielding conductor and the second shielding conductor are in contact with each other.
12. The electrical connection apparatus of claim 11, wherein the leakage current detection line further comprises a third shielding conductor that simultaneously encases the first shielding conductor and the second shielding conductor, the third shielding conductor being in contact with both the first shielding conductor and the second shielding conductor.
13. The electrical connection device of claim 10, wherein the power supply line comprises a first current carrying line and a second current carrying line, and the leakage current detection line comprises a third shielding conductor that simultaneously wraps the first current carrying line and the second current carrying line.
14. The electrical connection device of claim 11, wherein a first insulating layer is disposed between the first current carrying wire and the first shielding conductor, and a second insulating layer is disposed between the second current carrying wire and the second shielding conductor.
15. A powered device comprising a load device and an electrical connection device as claimed in any one of claims 10 to 14, the output of the power cord being connected to the load device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322372501.XU CN220711105U (en) | 2023-08-31 | 2023-08-31 | Detection protection device for power line, electric connection equipment and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322372501.XU CN220711105U (en) | 2023-08-31 | 2023-08-31 | Detection protection device for power line, electric connection equipment and electric equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220711105U true CN220711105U (en) | 2024-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322372501.XU Active CN220711105U (en) | 2023-08-31 | 2023-08-31 | Detection protection device for power line, electric connection equipment and electric equipment |
Country Status (1)
| Country | Link |
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| CN (1) | CN220711105U (en) |
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2023
- 2023-08-31 CN CN202322372501.XU patent/CN220711105U/en active Active
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