阅读说明：本技术 一种带有地线智能通断和地线带电检测的漏电保护插头 (Earth leakage protection plug with ground wire intelligence break-make and ground wire live detection ) 是由 杨爱国 于 2019-11-29 设计创作，主要内容包括：本发明涉及一种带有地线智能通断和地线带电检测的漏电保护插头,包括火线、零线、地线、地线接地检测电路、全波整流电路、分压电路、地线带电检测电路、地线继电器电路和继电器K3,地线带电检测电路包括光耦U2,地线接地检测电路包括光耦U1,地线继电器电路输入端与全波整流电路电连接,该地线继电器电路控制端与分压电路电连接,继电器K3的线圈输入端与地线继电器电路输出端相连接,该继电器K3的线圈输出端接地,该继电器K3的触点输出端和输入端分别连接在地线的两端,本插头具有检测地线是否正常使用的功能和检测地线是否带电功能,并通过检测到的地线状态自动判断是否与用电器外壳相连,避免了因外壳带电导致的触电事故的发生。(The invention relates to a leakage protection plug with intelligent ground wire on-off and live detection, which comprises a live wire, a zero line, a ground wire grounding detection circuit, a full-wave rectification circuit, a voltage division circuit, a ground wire live detection circuit, a ground wire relay circuit and a relay K3, wherein the ground wire live detection circuit comprises an optical coupler U2, the ground wire grounding detection circuit comprises an optical coupler U1, the input end of the ground wire relay circuit is electrically connected with the full-wave rectification circuit, the control end of the ground wire relay circuit is electrically connected with the voltage division circuit, the coil input end of the relay K3 is connected with the output end of the ground wire relay circuit, the coil output end of the relay K3 is grounded, 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 functions of detecting whether the ground wire is normally, the occurrence of electric shock accidents caused by the charged shell is avoided.)

1. An electric leakage protection plug with intelligent ground wire on-off and live ground wire detection is characterized by comprising a live wire, a zero line, a ground wire, an electric leakage protection circuit, a ground wire grounding detection circuit, a full-wave rectification circuit, a voltage division circuit, a ground wire live detection circuit, a ground wire relay circuit and a relay K3, wherein the electric leakage protection circuit is electrically connected with the output end of the full-wave rectification circuit, the ground wire live detection circuit comprises an optical coupler U2, the ground wire grounding detection circuit comprises an optical coupler U1, the anode of a light emitter of the optical coupler U1 is electrically connected with the live wire, the cathode of a light emitter of the optical coupler U1 is electrically connected with the ground wire, the anode of a light receiver of the optical coupler U1 is electrically connected with the output end of the full-wave rectification circuit, the cathode of the light receiver of the optical coupler U1 is respectively electrically connected with the anode of the light receiver of the optical coupler U2 and the voltage division circuit, the, the negative electrode of a light emitter of the optocoupler U2 is electrically connected with a zero line, the input end of a ground wire relay circuit is electrically connected with a full-wave rectification circuit, the control end of the ground wire relay circuit is electrically connected with a voltage division circuit, the coil input end of a relay K3 is connected with the output end of the ground wire relay circuit, the coil output end of the relay K3 is grounded, and the contact output end and the contact input end of the relay K3 are respectively connected with the two ends of a ground wire.

2. A leakage protection plug with intelligent ground wire on-off and live ground wire detection as claimed in claim 1, wherein said voltage divider circuit comprises a resistor R19 and a resistor R20, the resistor R19 is connected in series with the resistor R20, the positive pole of the resistor R19 is electrically connected to the negative pole of the light receiver of the optocoupler U1 and the positive pole of the light receiver of the optocoupler U2, respectively, and the negative pole of the resistor R20 is grounded.

3. A residual current protection plug with intelligent ground connection and live ground connection detection as claimed in claim 2, wherein said ground relay circuit comprises a transistor Q2, the B pole of the transistor Q2 is electrically connected to the positive pole of the resistor R20, the C pole of the transistor Q2 is electrically connected to the output terminal of the full-wave rectification circuit, and the E pole of the transistor Q2 is electrically connected to the coil input terminal of the relay K3.

4. A residual current protection plug with intelligent earth wire on-off and live earth wire detection according to claim 3, wherein said full wave rectification circuit comprises a bridge rectifier.

5. The earth leakage protection plug with intelligent ground wire on-off and live ground wire detection as claimed in claim 4, wherein the output terminal of said bridge rectifier is electrically connected to the input terminal of the filter voltage-reducing and voltage-stabilizing circuit, and the output terminal of the filter voltage-reducing and voltage-stabilizing circuit is electrically connected to the ground wire grounding detection circuit and the ground wire relay circuit, respectively.

6. The leakage protection plug with intelligent ground wire on-off and live ground wire detection of claim 5, wherein the filtering voltage-reducing voltage-stabilizing circuit comprises a voltage-regulator tube DW2, a capacitor C11 and a resistor R15, the voltage-regulator tube DW2 is connected with the capacitor C11 in series, and the voltage-regulator tube DW2 is connected with the resistor R15 in parallel.

7. The earth leakage protection plug with intelligent ground connection and live ground connection detection as claimed in claim 6, wherein the ground connection detection circuit further comprises a resistor R17, a diode D4, a resistor R18 and/or a capacitor C12, the resistor R17, the light emitter of the optocoupler U1, the resistor R18 and/or the capacitor C12 are connected in series, and the diode D4 is connected in parallel with the light emitter of the optocoupler U1.

8. A residual current protection plug with intelligent ground connection and live ground connection detection according to claim 7, characterized in that the coil of the relay K3 is connected in parallel with the LED 2.

9. An earth leakage protection plug with intelligent ground connection and live ground connection detection as claimed in claim 7, wherein the C pole of said transistor Q2 is electrically connected to the positive pole of LED2, the LED2 is electrically connected to the earth leakage protection circuit, the earth leakage protection circuit comprises a SCR whose G pole is electrically connected to the negative pole of LED2, a relay driver circuit electrically connected to the K pole of SCR, and a switch circuit electrically connected to the A pole of SCR and the relay driver circuit, the relay driver circuit is electrically connected to the switch circuit, the SCR is turned on to turn off the relay driver circuit, the relay driver circuit is turned off to turn off the switch circuit, the switch circuit comprises relay K1 and relay K2, the coil of relay K1 is connected in series with the coil of relay K2, the contact output end and the input end of the relay K1 are respectively connected to two ends of a live wire, the contact output end and the input end of the relay K2 are respectively connected to two ends of a zero wire, the coil input end of the relay K1 is electrically connected with the output end of a full-wave rectification circuit, the relay driving circuit comprises a triode Q1, a resistor R9 and a resistor R8, the resistor R9 is connected with the resistor R8 in series, the E pole of the triode Q1 is electrically connected with the output end of the full-wave rectification circuit, the C pole of the triode Q1 is electrically connected with the coil output end of the relay K2, and the B pole of the triode Q1 is electrically connected with the resistor R8.

Technical Field

The invention relates to the field of plugs, in particular to a leakage protection plug with intelligent on-off of a ground wire and live detection of the ground wire.

Background

The existing sockets in rural areas and mountainous areas are not provided with ground wires generally, the ground wires in the sockets can be incapable of being normally used due to reasons such as misconnection, poor grounding, disconnection and socket aging, the shells of electrical equipment are electrified, electric shock accidents are caused, and in order to prevent the occurrence of the event, a plug capable of judging whether the ground wires can be normally used and intelligently controlling the on-off of electrical equipment is needed.

Disclosure of Invention

In view of the current situation of the prior art, the technical problem to be solved by the present invention is to provide an earth leakage protection plug with intelligent on/off of a ground wire and live detection of the ground wire, so as to solve the problems of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows:

an electric leakage protection plug with intelligent ground wire on-off and live ground wire detection comprises a live wire, a zero line, a ground wire, an electric leakage protection circuit, a ground wire grounding detection circuit, a full-wave rectification circuit, a voltage division circuit, a ground wire live detection circuit, a ground wire relay circuit and a relay K3, wherein the electric leakage protection circuit is electrically connected with the output end of the full-wave rectification circuit, the ground wire live detection circuit comprises an optical coupler U2, the ground wire grounding detection circuit comprises an optical coupler U1, the anode of a light emitter of the optical coupler U1 is electrically connected with the live wire, the cathode of a light emitter of the optical coupler U1 is electrically connected with the ground wire, the anode of a light receiver of the optical coupler U1 is electrically connected with the output end of the full-wave rectification circuit, the cathode of a light receiver of the optical coupler U1 is respectively electrically connected with the anode of the light receiver of the optical coupler U2 and the voltage division circuit, the negative electrode of a light emitter of the optocoupler U2 is electrically connected with a zero line, the input end of a ground wire relay circuit is electrically connected with a full-wave rectification circuit, the control end of the ground wire relay circuit is electrically connected with a voltage division circuit, the coil input end of a relay K3 is connected with the output end of the ground wire relay circuit, the coil output end of the relay K3 is grounded, and the contact output end and the contact input end of the relay K3 are respectively connected with the two ends of a ground wire.

Preferably, the voltage dividing circuit includes a resistor R19 and a resistor R20, the resistor R19 is connected in series with the resistor R20, the anode of the resistor R19 is electrically connected to the cathode of the light receiver of the optocoupler U1 and the anode of the light receiver of the optocoupler U2, the cathode of the resistor R20 is grounded, and the voltage dividing circuit performs a voltage dividing function.

Preferably, the ground relay circuit comprises a triode Q2, the B pole of the triode Q2 is electrically connected with the positive pole of the resistor R20, 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, and the ground relay circuit can control whether the electrical appliance shell is connected with the ground wire, so that the function of preventing electric shock is achieved.

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 output end of the rectifier bridge stack is electrically connected with the input end of the filtering voltage-reducing and voltage-stabilizing circuit, and the output end of the filtering voltage-reducing and voltage-stabilizing circuit is electrically connected with the ground wire grounding detection circuit and the ground wire relay circuit respectively.

Preferably, the filtering voltage-reducing and voltage-stabilizing circuit comprises a voltage-stabilizing tube DW2, a capacitor C11 and a resistor R15, wherein the voltage-stabilizing tube DW2 is connected with the capacitor C11 in series, the voltage-stabilizing tube DW2 is connected with the resistor R15 in parallel, and the filtering voltage-reducing and voltage-stabilizing circuit plays a role in filtering, reducing voltage and stabilizing voltage, so that a circuit in the plug is protected, and the service life of the plug is prolonged.

Preferably, the ground wire grounding detection circuit further comprises a resistor R17, a diode D4, a resistor R18 and/or a capacitor C12, the resistor R17 is connected in series with a light emitter of the optocoupler U1, the resistor R18 is connected in series with the capacitor C12, and the diode D4 is connected in parallel with a light emitter of the optocoupler U1.

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 transistor Q2 is electrically connected to the positive pole of the light emitting diode LED2, the light emitting diode LED2 is connected to the earth leakage protection circuit, the earth leakage protection circuit includes a silicon controlled SCR, a relay driving circuit and a switching circuit, the G pole of the silicon controlled SCR is electrically connected to the negative pole of the light emitting diode LED2, the K pole of the silicon controlled SCR is grounded, the a pole of the silicon controlled SCR is electrically connected to the relay driving circuit, the relay driving circuit is electrically connected to the switching circuit, the conduction of the silicon controlled SCR disconnects the relay driving circuit, the disconnection of the relay driving circuit disconnects the switching circuit, the switching circuit includes a relay K1 and a relay K2, the coil of the relay K1 is connected in series with the coil of the relay K2, the contact output terminal and the contact input terminal of the relay K1 are respectively connected to both ends of the live wire, the contact output terminal and the contact input terminal of the relay K2 are respectively connected, the coil input end of the relay K1 is electrically connected with the output end of the full-wave rectifying circuit, the relay driving circuit comprises a triode Q1, a resistor R9 and a resistor R8, the resistor R9 is connected with the resistor R8 in series, the E pole of the triode Q1 is electrically connected with the output end of the full-wave rectifying circuit, the C pole of the triode Q1 is electrically connected with the coil output end of the relay K2, and the B pole of the triode Q1 is electrically connected with the resistor R8.

Compared with the prior art, the invention has the advantages that:

the plug has the functions of detecting whether the ground wire is normally used or not and detecting whether the ground wire is electrified or not, and automatically judging whether the ground wire is connected with the shell of an electric appliance or not according to the detected state of the ground wire, so that the occurrence of electric shock accidents caused by the electrification of the shell is avoided, the safety of people is ensured, the electric appliance can be simultaneously disconnected with a live wire and a zero line, and the safety performance of the electric appliance is further improved.

Drawings

FIG. 1 is a schematic circuit diagram 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 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 diagram of a ground line ground detection circuit according to the present invention;

FIG. 6 is a schematic diagram of a ground line ground detection circuit according to the present invention;

FIG. 7 is a schematic diagram of a ground line ground detection circuit according to the present invention;

FIG. 8 is a circuit schematic of the present invention;

fig. 9 is a schematic diagram of the circuit of fig. 8 in accordance with the present invention.

Detailed Description