CN217115614U - Power line leakage detection and protection circuit - Google Patents
Power line leakage detection and protection circuit Download PDFInfo
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- CN217115614U CN217115614U CN202220549009.8U CN202220549009U CN217115614U CN 217115614 U CN217115614 U CN 217115614U CN 202220549009 U CN202220549009 U CN 202220549009U CN 217115614 U CN217115614 U CN 217115614U
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Abstract
The utility model discloses a power cord leakage detection earth leakage protection circuit is including the live wire, zero line and trip coil, be equipped with the controlled switch who receives the trip coil control on live wire and the zero line respectively, the live wire and the zero line outside are equipped with the shielded wire respectively, two shielded wire end-to-end connections, be equipped with between live wire and the zero line respectively with two shielded wire head ends be connected and be used for detecting whether cracked shielded wire detection circuitry of shielded wire has, shielded wire detection circuitry is connected with the control circuit who controls trip coil when detecting the shielded wire fracture and make the controlled switch disconnection, the sinle silk exposes behind the prevention shielded wire fracture, make the short circuit cause the fire incident between live wire and the zero line.
Description
[ technical field ]
The utility model relates to a power cord electric leakage detection earth leakage protection circuit.
[ background art ]
When the power line sheath of the electric appliance is broken due to abrasion or accidental factors such as biting by an animal in normal use, the wire core of the power line can be exposed, the short circuit between the live wire and the zero line is easy to occur in the use process, and the fire accident is caused, so that the wire core is exposed in order to prevent the accidental breakage of the power line sheath, the shielding layer for protecting the wire core is generally wrapped outside the power line, but the shielding layer can not completely prevent the exposed condition of the wire core of the power line caused by the biting.
[ contents of utility model ]
The utility model overcomes above-mentioned technique is not enough, provides a power cord electric leakage detection earth leakage protection circuit.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
the utility model provides a power cord electric leakage detection earth leakage protection circuit which characterized in that: the device comprises a live wire, a zero line and a trip coil, wherein controlled switches controlled by the trip coil are respectively arranged on the live wire and the zero line, shielding wires are respectively arranged on the outer sides of the live wire and the zero line, the tail ends of the two shielding wires are connected, a shielding wire detection circuit which is respectively connected with the head ends of the two shielding wires and used for detecting whether the shielding wires are broken is arranged between the live wire and the zero line, and the shielding wire detection circuit is connected with a control circuit which controls the trip coil to break the controlled switches when the shielding wires are broken.
The power line leakage detection and protection circuit is characterized in that: and a test key circuit for testing whether the shielding wire detection circuit is normal is arranged between the live wire and the shielding wire detection circuit.
The power line leakage detection and protection circuit is characterized in that: an indicating lamp circuit used for prompting the working state is arranged between the live wire and the zero wire.
The power line leakage detection and protection circuit is characterized in that: and insulating layers are respectively arranged on the outer side of the shielding wire of the live wire and the outer side of the shielding wire of the zero line.
The power line leakage detection and protection circuit is characterized in that: the shielded wire detection circuit comprises a switch tube Q2, a collector of the switch tube Q2 is respectively connected with one end of a resistor R10 and the cathode of a diode D3, a base of the switch tube Q2 is respectively connected with the other end of the resistor R10 and the head end of a shielded wire of a live wire through a resistor R11, an emitter of the switch tube Q2 is respectively connected with a pin 1 of a rectifier bridge DB1 and the head end of the shielded wire of the live wire through a resistor R12, an anode of the diode D3 is respectively connected with the live wire and one end of a resistor R7, the other end of the resistor R7 is respectively connected with a pin 3 of the rectifier bridge DB1, one end of a resistor R6 is connected, the other end of the resistor R6 is connected with a zero line, a pin 2 of a rectifier bridge DB1 is respectively connected with one end of a capacitor C2, one end of a resistor R9 and a pin 1 of a photoelectric coupler U1, a pin 4 of the rectifier bridge DB1 is respectively connected with the other end of the capacitor C2, the other end of the resistor R9 and the pin 2 of the photoelectric coupler U1, and pins 3-4 of the photoelectric coupler U1 are respectively connected with a control circuit.
The power line leakage detection and protection circuit is characterized in that: the control circuit comprises a Silicon Controlled Rectifier (SCR), the anode end of the Silicon Controlled Rectifier (SCR) is respectively connected with one end of a trip coil, the anode end of a diode D2, the other end of the trip coil is connected with a live wire, the cathode end of a diode D2 is respectively connected with a shielded wire detection circuit through a resistor R2, one end of a resistor R3, the control end of the Silicon Controlled Rectifier (SCR) is respectively connected with one end of a capacitor C1 and one end of a resistor R4, the other end of the resistor R4 is respectively connected with the shielded wire detection circuit and the resistor R1, the cathode end of the Silicon Controlled Rectifier (SCR), the other end of the resistor R3, the other end of the resistor R1 and the other end of the capacitor C1 are respectively connected with a zero line.
The power line leakage detection and protection circuit is characterized in that: a bidirectional transient suppression diode Q1 for overvoltage protection is connected in parallel to the resistor R3.
The utility model has the advantages that:
the utility model discloses wrap up the one deck shielded wire in the live wire and the zero line outside to with the terminal short circuit of two shielded wires formation route, be equipped with between two shielded wire head ends and be used for detecting whether cracked shielded wire exists the shielded wire detection circuitry, control circuit control trip coil work makes the controlled switch disconnection after detecting the shielded wire fracture, thereby makes earth leakage protection circuit outage, and the sinle silk exposes after the prevention shielded wire fracture, makes the short circuit cause the fire incident between live wire and the zero line.
[ description of the drawings ]
Fig. 1 is a schematic structural diagram of the present invention.
[ detailed description of the invention ]
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly. In addition, the descriptions related to "preferred", "less preferred", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "preferred" or "less preferred" may explicitly or implicitly include at least one such feature.
As shown in fig. 1, a power line leakage detection leakage protection circuit, including live wire, zero line and trip coil 1, be equipped with controlled switch 2 that is controlled by trip coil 1 on live wire and the zero line respectively, the live wire and the zero line outside are equipped with shielded wire 3 respectively, 3 end-to-end connections of two shielded wires, be equipped with between live wire and the zero line respectively with 3 head ends of two shielded wires be connected and be used for detecting shielded wire 3 have cracked shielded wire detection circuitry 4, shielded wire detection circuitry 4 is connected with the control circuit 5 that makes controlled switch 2 break off when detecting that shielded wire 3 breaks off from tripping coil 1.
When the leakage protector is used, the reset key of the leakage protector is pressed, and the controlled switch 2 is reset to electrify the leakage protector; in the use process, the shielding wire 3 is broken under the action of external force, the shielding wire detection circuit 4 sends a detection signal to the control circuit 5 at the moment, and the control circuit 5 controls the trip coil 1 to work to disconnect the controlled switch 2 and the leakage protector.
Wherein 3 outsides of the shielded wire of live wire, the shielded wire 3 outsides of zero line are equipped with the insulating layer respectively, prevent that live wire and zero line from setting up side by side, 3 contact short circuits of both sides shielded wire can not play the detection effect of shielded wire integrality.
As shown in figure 1, an indicator light circuit 7 used for prompting the working state is arranged between the live wire and the zero wire, when a reset key is pressed to reset the controlled switch 2, and after the leakage protector is electrified, the indicator light LED emits light to prompt the working state.
As shown in fig. 1, the shielded wire detection circuit 4 includes a switching tube Q2, a collector of the switching tube Q2 is respectively connected to one end of a resistor R10 and a cathode of a diode D3, a base of the switching tube Q2 is respectively connected to the other end of a resistor R10 and a head end of a shielded wire 3 of a live wire through a resistor R11, an emitter of the switching tube Q2 is respectively connected to a pin 1 of a rectifier bridge DB1 and a head end of a shielded wire 3 of a live wire through a resistor R12, a positive end of a diode D3 is respectively connected to a live wire and one end of a resistor R7, the other end of a resistor R7 is respectively connected to a pin 3 of a rectifier bridge DB1 and one end of a resistor R6, the other end of a resistor R6 is connected to a neutral wire, a pin 2 of a rectifier bridge DB1 is respectively connected to one end of a capacitor C2, one end of a resistor R9 and a pin 1 of a photocoupler U1, a pin 4 of the rectifier bridge DB1 is respectively connected to the other end of a capacitor C2, the other end of the resistor R9, and a pin 3-5 of a photoelectric coupler U6855, the switching tube Q2 is a switching triode, a MOS tube or a MOFSET tube.
The control circuit 5 comprises a Silicon Controlled Rectifier (SCR), the anode end of the Silicon Controlled Rectifier (SCR) is respectively connected with one end of a trip coil 1 and the anode end of a diode D2, the other end of the trip coil 1 is connected with a live wire, the cathode end of a diode D2 is respectively connected with a shielded wire detection circuit 4 and one end of a resistor R3 through a resistor R2, the control end of the Silicon Controlled Rectifier (SCR) is respectively connected with one end of a capacitor C1 and one end of a resistor R4, the other end of the resistor R4 is respectively connected with the shielded wire detection circuit 4 and the resistor R1, the cathode end of the Silicon Controlled Rectifier (SCR), the other end of the resistor R3, the other end of the resistor R1 and the other end of the capacitor C1 are respectively connected with a zero line.
After a reset key of the leakage protector is pressed, the controlled switch 2 is reset to electrify the leakage protector, and at the moment, because the tail ends of the shielding wires 3 on the live wire side and the zero wire side are in short circuit, the base electrode of the switch tube Q2 is the same as the voltage of the emitter, and the switch tube Q2 is not conducted; when the shielded wire 3 of live wire or zero line side is cracked, shielded wire 3 is the broken circuit promptly, the switch tube Q2 base is connected for high voltage with the live wire this moment, switch tube Q2 projecting pole is connected for low-voltage with the zero line, make switch tube Q2 switch on, thereby make rectifier bridge DB1 form the route, rectifier bridge DB1 pin 2 and pin 4 respectively with to optoelectronic coupler U1 pin 1 and pin 2 output current this moment, optoelectronic coupler U1 pin 3 and pin 4 output power, send control signal to the control end of silicon controlled rectifier SCR, make silicon controlled rectifier SCR switch on, thereby make trip coil 1 circular telegram work, control controlled switch 2 disconnection, make earth leakage protector cut off, realize earth leakage protection function.
As shown in fig. 1, a bidirectional transient suppression diode Q1 for overvoltage protection is connected in parallel to the resistor R3 for overvoltage protection to prevent circuit components from being burned.
As shown in fig. 1, a TEST key circuit 6 for testing whether the shield line detection circuit 4 is normal is arranged between the live wire and the shield line detection circuit 4, and when the TEST key is pressed to simulate the break of the shield line 3, the base of the switch tube Q2 is connected with the live wire to be high voltage, and the emitter of the switch tube Q2 is connected with the zero line to be low voltage, so that the switch tube Q2 is turned on, and the working principle is the same as the working principle of the broken shield line 3.
The above is only the preferred embodiment of the present invention, not limiting the patent scope of the present invention, all of which are under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct or indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (7)
1. The utility model provides a power cord electric leakage detection earth leakage protection circuit which characterized in that: including the live wire, zero line and trip coil (1), be equipped with controlled switch (2) that receive trip coil (1) control on live wire and the zero line respectively, the live wire and zero line outside are equipped with shielded wire (3) respectively, two shielded wire (3) end-to-end connection, be equipped with between live wire and the zero line respectively with two shielded wire (3) head ends be connected and be used for detecting whether cracked shielded wire detection circuitry (4) have, shielded wire detection circuitry (4) are connected with when detecting shielded wire (3) fracture control trip coil (1) make controlled switch (2) break off control circuit (5).
2. The power line leakage detection and protection circuit of claim 1, wherein: and a test key circuit (6) for testing whether the shielding wire detection circuit (4) is normal is arranged between the live wire and the shielding wire detection circuit (4).
3. The power line leakage detection and protection circuit of claim 1, wherein: an indicator light circuit (7) used for prompting the working state is arranged between the live wire and the zero wire.
4. The power line leakage detection and protection circuit of claim 1, wherein: and insulating layers are respectively arranged on the outer side of the shielding wire (3) of the live wire and the outer side of the shielding wire (3) of the zero line.
5. The power line leakage detection and protection circuit of claim 1, wherein: the shielded wire detection circuit (4) comprises a switch tube Q2, a collector of the switch tube Q2 is respectively connected with one end of a resistor R10 and the negative end of a diode D3, a base of the switch tube Q2 is respectively connected with the other end of the resistor R10 and the head end of a shielded wire (3) of a live wire through a resistor R11, an emitter of the switch tube Q2 is respectively connected with a pin 1 of a rectifier bridge DB1 and the head end of the shielded wire (3) of the live wire through a resistor R12, a positive end of the diode D3 is respectively connected with the live wire and one end of a resistor R7, the other end of the resistor R7 is respectively connected with a pin 3 of the rectifier bridge DB1, one end of a resistor R6 is connected, the other end of the resistor R6 is connected with a zero line, a pin 2 of a rectifier bridge DB1 is respectively connected with one end of a capacitor C2, one end of a resistor R9 and a pin 1 of a photoelectric coupler U1, a pin 4 of the rectifier bridge DB1 is respectively connected with the other end of the capacitor C2, the other end of the resistor R9 and a pin 2 of the photoelectric coupler U1, and pins 3-4 of the photoelectric coupler U1 are respectively connected with a control circuit (5).
6. The power line leakage detection and protection circuit of claim 1, wherein: control circuit (5) is including silicon controlled rectifier SCR, silicon controlled rectifier SCR anode end respectively with trip coil (1) one end, diode D2 positive terminal is connected, the trip coil (1) other end is connected with the live wire, diode D2 negative pole end respectively with shielded wire detection circuitry (4) through resistance R2, resistance R3 one end is connected, silicon controlled rectifier SCR control end respectively with electric capacity C1 one end, resistance R4 one end is connected, the resistance R4 other end respectively with shielded wire detection circuitry (4), resistance R1 is connected, silicon controlled rectifier SCR cathode end, the resistance R3 other end, the resistance R1 other end, the electric capacity C1 other end is connected with the zero line respectively.
7. The power line leakage detection and protection circuit of claim 6, wherein: a bidirectional transient suppression diode Q1 for overvoltage protection is connected in parallel to the resistor R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220549009.8U CN217115614U (en) | 2022-03-14 | 2022-03-14 | Power line leakage detection and protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220549009.8U CN217115614U (en) | 2022-03-14 | 2022-03-14 | Power line leakage detection and protection circuit |
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| Publication Number | Publication Date |
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| CN217115614U true CN217115614U (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220549009.8U Active CN217115614U (en) | 2022-03-14 | 2022-03-14 | Power line leakage detection and protection circuit |
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| CN (1) | CN217115614U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023173454A1 (en) * | 2022-03-14 | 2023-09-21 | 中山市开普电器有限公司 | Power line electronic leak detection and electronic leak protection circuit |
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2022
- 2022-03-14 CN CN202220549009.8U patent/CN217115614U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023173454A1 (en) * | 2022-03-14 | 2023-09-21 | 中山市开普电器有限公司 | Power line electronic leak detection and electronic leak protection circuit |
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