CN210723574U

CN210723574U - Leakage protection plug with ground wire intelligence break-make

Info

Publication number: CN210723574U
Application number: CN201922115277.XU
Authority: CN
Inventors: 杨爱国
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-06-09
Anticipated expiration: 2029-11-29

Abstract

The utility model relates to a leakage protection plug with intelligent on-off of ground wire, which comprises a live wire, a zero line, a ground wire, a full-wave rectification circuit, a voltage division circuit, a leakage protection circuit, a ground wire relay circuit and a relay K3, wherein a ground wire ground fault detection circuit is arranged between the live wire and the ground wire, the input end of the full-wave rectification circuit is respectively connected with the live wire and the zero line, the output end of the full-wave rectification circuit is respectively connected with the input ends of the voltage division circuit, the ground wire relay circuit and the leakage protection circuit, the coil input end of the relay K3 is connected with the output end of the ground wire relay circuit, the contact output end and the input end of the relay K3 are respectively connected with the two ends of the ground wire, the plug has the function of automatically judging whether the ground wire can be normally switched on or not, the occurrence of, if the ground wire can be normally used, the electric appliance can be connected with the ground wire, and the safety of people is ensured.

Description

Leakage protection plug with ground wire intelligence break-make

Technical Field

The utility model relates to a plug field especially relates to a leakage protection plug with ground wire intelligence break-make.

Background

The existing sockets in rural areas and mountainous areas are not provided with ground wires, the ground wires in the sockets can be abnormally used due to reasons of misconnection, poor grounding, disconnection, socket aging and the like, and therefore electric shock accidents are caused.

SUMMERY OF THE UTILITY MODEL

To the current situation of above-mentioned prior art, the utility model aims to solve the technical problem that an earth leakage protection plug with ground wire intelligence break-make is provided to solve prior art problem.

The utility model provides a technical scheme that above-mentioned technical problem adopted does:

the utility model provides an earth leakage protection plug with ground wire intelligence break-make, includes live wire, zero line, ground wire, full wave rectifier circuit, earth leakage protection circuit, bleeder circuit, ground wire relay circuit and relay K3, be equipped with ground wire earth fault detection circuitry between live wire and the ground wire, full wave rectifier circuit's input is connected with live wire and zero line respectively, and this full wave rectifier circuit's output is connected with bleeder circuit, ground wire relay circuit and earth leakage protection circuit's input respectively, relay K3's coil input is connected with ground wire relay circuit output, and this relay K3's coil output ground connection, and this relay K3's contact output and input are connected respectively at the both ends of ground wire.

Preferably, the ground line ground fault detection circuit comprises an optocoupler U1, a diode D4, a capacitor C12 and/or a resistor R16, a capacitor C13 and/or a resistor R17, wherein the capacitor C12 and/or the resistor R16 are/is connected in series between a live line and a ground line, a light emitter of the optocoupler U1, a capacitor C13 and/or a resistor R17 are/is connected in series between a zero line and the ground line, the diode D4 is connected in parallel to the light emitter of the optocoupler U1, and the ground line ground fault detection circuit can be matched with a voltage division circuit to detect the ground line in the socket, so that whether the ground line can be normally switched on or off is detected.

Preferably, the voltage division circuit comprises a resistor R19 and a resistor R20, the resistor R19 is connected with the resistor R20 in series, the input end of a light receiver of the optical coupler U1 is respectively electrically connected with the output end of the full-wave rectification circuit and the resistor R19, the output end of the light receiver of the optical coupler U1 is grounded, the resistor R20 is connected with the light receiver of the optical coupler U1 in parallel, the on-off of the relay K3 can be indirectly controlled by arranging the optical coupler, and the voltage division circuit has the advantages of small size, long service life, no contact and strong anti-interference capability.

Preferably, the ground relay circuit comprises a triode Q2, the C pole of the triode Q2 is electrically connected with the output end of the full-wave rectification circuit, the E pole of the triode Q2 is electrically connected with the coil input end of the relay K3, the B pole of the triode Q2 is connected between a resistor R20 and a resistor R19, and the on-off of the relay K3 is controlled through the triode Q2, so that whether the electric appliance shell is connected with the ground line or not is controlled.

Preferably, the full-wave rectification circuit comprises a rectifier bridge stack, and the rectifier bridge stack can convert alternating current into direct current for plugs and electrical appliances.

Preferably, the coil of the relay K3 is connected in parallel with the light emitting diode LED2, and the light emitting diode LED2 is not lighted when the ground is connected, so that a user can conveniently know whether the electric appliance casing is connected with the ground.

Preferably, the C pole of the triode Q2 is electrically connected with the anode of the light emitting diode LED2, the light emitting diode LED2 is connected with the leakage protection circuit, the leakage protection circuit comprises a silicon controlled rectifier SCR, a relay driving circuit and a switch circuit, the G pole of the silicon controlled rectifier SCR is electrically connected with the cathode of the light emitting diode LED2, the K pole of the silicon controlled rectifier SCR is grounded, the a pole of the silicon controlled rectifier SCR is electrically connected with the relay driving circuit, the relay driving circuit is electrically connected with the switch circuit, when the ground wire cannot work normally, the conduction of the silicon controlled rectifier SCR can disconnect the relay driving circuit, the relay driving circuit disconnects the switch circuit, and the disconnection of the switch circuit can stop the electric appliance to prevent people from getting an electric shock.

Preferably, the switch circuit comprises a relay K1 and a relay K2, a coil of the relay K1 is connected with a coil of the relay K2 in series, a contact output end and an input end of the relay K1 are connected to two ends of a live wire respectively, a contact output end and an input end of the relay K2 are connected to two ends of a zero wire respectively, a coil input end of the relay K1 is electrically connected with an output end of a full-wave rectification circuit, the relay K1 controls the conduction of the live wire, the relay K2 controls the conduction of the zero wire, and the live wire or the zero wire is disconnected so as to prevent an electric appliance shell from being electrified.

Preferably, the relay driving circuit comprises a triode Q1, a resistor R9 and a resistor R8, the resistor R9 is connected in series with the resistor R8, the pole E of the triode Q1 is electrically connected with the output end of the full-wave rectifying circuit, the pole C of the triode Q1 is electrically connected with the coil output end of the relay K2, the pole B of the triode Q1 is electrically connected with the resistor R8, and the conduction and the disconnection of the switching circuit are indirectly controlled by controlling the conduction and the disconnection between the pole E and the pole C of the triode Q1, so that the on-off of a live wire and a zero wire are controlled, and the purpose of preventing electric shock is achieved.

Compared with the prior art, the utility model has the advantages of:

can judge automatically whether normal break-make of ground wire, if the ground wire can not be used, then be connected between disconnection electrical apparatus and the ground wire, avoided by reasons such as ground wire misconnection in the socket, ground wire ground connection is bad or disconnection, socket are ageing, make electrical equipment shell electrified, lead to the emergence of electric shock accident, also can make electrical apparatus and live wire and zero line break off simultaneously, further improved the security performance of electrical apparatus, if the ground wire can normal use, can make electrical apparatus and ground wire link to each other, guaranteed people's safety, the utility model relates to a rationally, accord with market demand, be fit for promoting.

Drawings

Fig. 1 is a schematic circuit diagram of a first embodiment of the present invention;

fig. 2 is a schematic diagram of the circuit of fig. 1 according to the present invention;

fig. 3 is a schematic circuit diagram according to a first embodiment of the present invention;

fig. 4 is a schematic diagram of the circuit of fig. 3 according to the present invention;

fig. 5 is a schematic circuit diagram of a second embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a second embodiment of the present invention;

fig. 7 is a schematic diagram of a ground fault detection circuit of the middle ground wire of the present invention;

fig. 8 is a schematic diagram of a ground fault detection circuit of the middle ground wire of the present invention;

fig. 9 is a schematic diagram of the ground fault detection circuit of the middle ground wire of the present invention.

Detailed Description

The first embodiment is as follows:

as shown in fig. 1-4, when the socket is operated, current flows from the live wire to the ground fault detection circuit and the full wave rectifier circuit, when the ground wire can be used normally, a part of current flows from the ground wire directly from the ground fault detection circuit, at this time, the light emitter of the optocoupler U1 is not powered, the light receiver of the optocoupler U1 is not powered, the current flows from the full wave rectifier circuit to the ground relay circuit, the B electrode of the transistor Q2 is at a high level, the C electrode and the E electrode of the transistor Q2 are connected, the coil end of the relay K3 is powered, the contact end of the relay K3 is closed, the ground wire is connected, if the ground wire in the socket cannot be used normally, the current flows from the ground fault detection circuit to the light emitter of the optocoupler U1, the light emitter of the optocoupler U1 starts to emit light, the light receiver of the optocoupler U1 is powered, the current flows from the full wave rectifier circuit to the, at the moment, the B electrode of the triode Q2 is at a low level, the C electrode and the E electrode of the triode Q2 are not conducted, the coil end of the relay K3 is not electrified, the contact of the relay K3 is separated, the ground wire is disconnected, the electric appliance shell is separated from the ground wire, and the light-emitting diode LED2 is electrified and lightened, so that the electric appliance shell is isolated, and electric shock is prevented.

Example two:

as shown in fig. 5-6, the second embodiment is different from the first embodiment in that when the ground fault detection circuit detects that the ground wire can be used normally, the LED2 is not powered, the G pole of the SCR is at a low level, the K pole and the a pole of the SCR are not powered, the B pole of the Q1 is at a high level, the C pole and the E pole of the Q1 are powered, the coils of the K1 and the K2 are powered, the contacts on the K1 and the K2 are closed, the live wire and the zero wire are both powered, the electric appliance starts to operate when powered, when the ground fault detection circuit detects that the ground wire cannot be used normally, the LED2 is powered and lighted, the G pole of the SCR is at a high level, the K pole and the a pole of the SCR are powered, current flows between the K pole and the a pole of the SCR, the B pole of the Q1 is at a low level, the C pole and the E pole of the triode Q1 are not conducted, the coils of the relay K1 and the relay K2 are not electrified, the contacts on the relay K1 and the relay K2 are separated, the live wire and the zero wire are both disconnected, the electric appliance is powered off, the safety performance of the electric appliance is further improved, and the electric shock is thoroughly prevented.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a leakage protection plug with ground wire intelligence break-make, its characterized in that, includes live wire, zero line, ground wire, full wave rectifier circuit, leakage protection circuit, bleeder circuit, ground wire relay circuit and relay K3, be equipped with ground wire earth fault detection circuit between live wire and the ground wire, full wave rectifier circuit's input is connected with live wire and zero line respectively, and this full wave rectifier circuit's output is connected with bleeder circuit, ground wire relay circuit and leakage protection circuit's input respectively, relay K3's coil input is connected with ground wire relay circuit output, and this relay K3's coil output ground connection, this relay K3's contact output and input are connected respectively at the both ends of ground wire.

2. The leakage protection plug with intelligent ground wire switching function according to claim 1, wherein the ground wire ground fault detection circuit comprises an optocoupler U1, a diode D4, a capacitor C12 and/or a resistor R16, a capacitor C13 and/or a resistor R17, the capacitor C12 and/or the resistor R16 are connected in series between a live wire and a ground wire, a light emitter of the optocoupler U1, a capacitor C13 and/or a resistor R17 are connected in series between the neutral wire and the ground wire, and the diode D4 is connected in parallel to the light emitter of the optocoupler U1.

3. The earth leakage protection plug with intelligent ground wire switching function as claimed in claim 2, wherein the voltage divider circuit comprises a resistor R19 and a resistor R20, the resistor R19 and the resistor R20 are connected in series, an input end of a light receiver of the optocoupler U1 is electrically connected with an output end of the full-wave rectifying circuit and a resistor R19, an output end of the optocoupler U1 is grounded, and the resistor R20 is electrically connected with an output end of the optocoupler U1.

4. The earth leakage protection plug of claim 3, wherein said earth relay circuit comprises a transistor Q2, the C pole of said transistor Q2 is electrically connected to the output of the full-wave rectification circuit, the E pole of said transistor Q2 is electrically connected to the coil input of the relay K3, and the B pole of said transistor Q2 is connected between the resistor R20 and the resistor R19.

5. The earth leakage protection plug with intelligent ground connection switching function as claimed in claim 4, wherein said full-wave rectification circuit comprises a bridge rectifier stack.

6. The earth leakage protection plug with intelligent ground connection and disconnection functions as claimed in claim 5, wherein a coil of the relay K3 is connected in parallel with a light emitting diode LED 2.

7. The earth leakage protection plug with intelligent ground connection and disconnection functions as claimed in claim 5, wherein a C pole of the transistor Q2 is electrically connected with an anode of the light emitting diode LED2, the light emitting diode LED2 is electrically connected with an earth leakage protection circuit, the earth leakage protection circuit comprises a Silicon Controlled Rectifier (SCR), a relay driving circuit and a switch circuit, a G pole of the Silicon Controlled Rectifier (SCR) is electrically connected with a cathode of the light emitting diode LED2, a K pole of the Silicon Controlled Rectifier (SCR) is grounded, an A pole of the Silicon Controlled Rectifier (SCR) is electrically connected with the relay driving circuit, the relay driving circuit is electrically connected with the switch circuit, the conduction of the Silicon Controlled Rectifier (SCR) enables the relay driving circuit to be disconnected, and the disconnection of the relay driving circuit enables the switch circuit to be disconnected.

8. The earth leakage protection plug with intelligent ground wire switching function according to claim 7, wherein the switching circuit comprises a relay K1 and a relay K2, a coil of the relay K1 is connected in series with a coil of the relay K2, a contact output end and an input end of the relay K1 are respectively connected to two ends of a live wire, a contact output end and an input end of the relay K2 are respectively connected to two ends of a zero wire, and a coil input end of the relay K1 is electrically connected with an output end of a full wave rectifying circuit.

9. The earth leakage protection plug of claim 8, wherein the relay driver circuit comprises a transistor Q1, a resistor R9 and a resistor R8, the resistor R9 is connected in series with the resistor R8, the E pole of the transistor Q1 is electrically connected to the output end of the full-wave rectification circuit, the C pole of the transistor Q1 is electrically connected to the coil output end of the relay K2, and the B pole of the transistor Q1 is electrically connected to the resistor R8.