Anti-electric shock socket

Abstract

The utility model belongs to the technical field of electric leakage detection, and particularly relates to an anti-electric shock socket, which comprises a socket body, a ground wire connecting piece, a null line wiring piece, a live wire wiring piece, a voltage detection circuit, a control module and a power cut-off circuit, and the ground wire connecting piece, the null line wiring piece and the live wire wiring piece are arranged on the socket body. The electric leakage voltage of the socket is detected through the voltage detection circuit and the detection signal is generated, and the control module controls the disconnection of the power supply switching circuit according to the detection signal output by the voltage detection circuit, so that power can be timely cut off when the socket leaks electricity, and electric shock is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of leakage detection, and in particular relates to an electric shock prevention socket. Background Art

[0002] Electric shock is the common name for electric injury, which usually refers to tissue damage and functional disorders caused by the human body directly touching the power source or high voltage electricity transmitting current through the air or other conductive media through the human body. In severe cases, cardiac and respiratory arrest may occur.

[0003] Most of the existing household appliances, such as rice cookers, electric irons, electric fans, washing machines, etc., obtain power by connecting to sockets. The sockets are often filled with magazines or liquids due to the installation position and other reasons, causing leakage. When household appliances are plugged into the sockets, electric shock is likely to occur. Therefore, when the socket leaks, being able to disconnect the power supply in time to avoid electric shock is one of the problems that need to be solved urgently. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides an anti-electric shock socket, which aims to achieve timely power cut-off when the socket leaks electricity to avoid electric shock.

[0005] In order to realize the above technical solution, the utility model provides an anti-electric shock socket, including: a socket body and a ground wire connector, a neutral wire connector and a live wire connector arranged on the socket body, and a voltage detection circuit, a control module and a power cut-off circuit are also arranged in the socket body;

[0006] The input end of the voltage detection circuit is connected to the ground wire connection member and the neutral wire connection member to detect the leakage voltage between the ground wire connection member and the neutral wire connection member and output detection information;

[0007] The control module is connected to the output end of the voltage detection circuit to receive and process the detection information;

[0008] The power cut-off circuit is arranged between the mains power supply and the live wire, the neutral wire and the ground wire connected to the ground wire connector, the neutral wire connector and the live wire connector to cut off the mains power supply;

[0009] The control module is connected to the power cut-off circuit to control the power cut-off circuit to cut off the power supply of the electric shock socket.

[0010] Further, the voltage detection circuit includes: a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a Zener diode Z1, a first transistor Q1 and a second transistor Q2;

[0011] A first end of the first capacitor C1 is connected to the neutral line connection member, a first end of the first resistor R1 and a first end of the second resistor R2;

[0012] The second end of the first capacitor C1 is connected to the ground wire connection piece, the second end of the first resistor R1, the second end of the third resistor R3, the emitter of the first transistor Q1, the emitter of the second transistor Q2 and the output end of the voltage detection circuit;

[0013] The second end of the second resistor R2 is connected to the cathode of the Zener diode Z1; the anode of the Zener diode Z1 is connected to the first end of the third resistor R3, the first end of the fourth resistor R4 and the base of the transistor Q1; the second end of the fourth resistor R4 is connected to the collector of the first transistor Q1, the base of the second transistor Q2 and the collector of the second transistor Q2.

[0014] Further, the power cut-off circuit includes: a fifth resistor R5, a third transistor Q3, and a first relay KR1, a second relay KR2, and a third relay KR3;

[0015] A first end of the fifth resistor R5 is connected to the control module; a second end of the fifth resistor R5 is connected to the base of the third transistor Q3; and an emitter of the third transistor Q3 is grounded;

[0016] The collector of the third transistor Q3 is connected to the first end of the coil K1 of the first relay KR1, the first end of the coil K2 of the second relay KR2 and the first end of the coil K3 of the third relay KR3;

[0017] The second end of the coil K1 of the first relay KR1, the second end of the coil K2 of the second relay KR2 and the second end of the coil K3 of the third relay KR3 are all connected to the power supply Vcc;

[0018] The live wire, neutral wire and ground wire of the AC power supply for the electric shock protection socket are connected to the live wire connection piece, neutral wire connection piece and ground wire connection piece through the switch S1 of the first relay KR1, the switch S2 of the second relay KR2 and the switch S3 of the third relay KR3 respectively.

[0019] Furthermore, the control module adopts a single chip microcomputer.

[0020] Furthermore, both the first transistor Q1 and the second transistor Q2 are NPN transistors.

[0021] Furthermore, the first relay KR1, the second relay KR2 and the third relay KR3 are all normally closed electric shock relays.

[0022] The beneficial effects of the utility model are:

[0023] The utility model detects the leakage voltage of the socket through a voltage detection circuit and generates a detection signal. The control module controls the disconnection of the power switching circuit according to the detection signal output by the voltage detection circuit, thereby helping to cut off the power in time when the socket leaks electricity to avoid electric shock.

[0024] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0026] Figure 1 The utility model is a schematic structural diagram of an embodiment of an electric shock protection socket.

[0027] Figure 2 This is the circuit diagram of the voltage detection circuit.

[0028] Figure 3 Circuit diagram for power cut circuit.

[0029] Figure 4 for Figure 1 The circuit diagram of the anti-electric shock socket is shown.

[0030] 1-live wire connection piece; 2-neutral wire connection piece; 3-ground wire connection piece; 4-voltage detection circuit; 5-control module; 6-power cut-off circuit; 7-mains power supply; 8-live wire; 9-neutral wire; 10-ground wire. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, each technical and scientific term used in this embodiment has the same meaning as commonly understood by ordinary maintenance personnel in the technical field to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0035] In the present utility model, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or maintenance personnel in this field, the specific meanings of the above terms in the present utility model can be determined according to specific circumstances, and they cannot be understood as limitations on the present utility model.

[0036] Embodiment 1:

[0037] like Figure 1 As shown, this embodiment provides an anti-electric shock socket, including: a socket body and a ground wire connector 2, a neutral wire connector and a live wire connector 1 arranged on the socket body, and a voltage detection circuit 4, a control module 5 and a power cut-off circuit 6 are also arranged in the socket body.

[0038] The input end of the voltage detection circuit 4 is connected to the ground wire connection member 2 and the neutral wire connection member 1 to detect the voltage between the ground wire connection member 2 and the neutral wire connection member 1, and outputs detection information, that is, an enable signal, according to the detected voltage value.

[0039] The control module 5 is connected to the output end of the voltage detection circuit 4 to receive and process the enable signal.

[0040] The control module 5 is connected to the power cut-off circuit 6 . Based on the received enable signal, the control module controls the power cut-off circuit 6 to perform a cut-off action to cut off the mains power 7 that supplies power to the anti-electric shock socket.

[0041] The power cut-off circuit is arranged between the mains power supply and the live wire, the neutral wire and the ground wire connected to the ground wire connector, the neutral wire connector and the live wire connector to cut off the mains power supply.

[0042] This embodiment detects the leakage voltage between the neutral wire and the ground wire of the anti-electric shock socket, and controls the power cut-off circuit to cut off the AC power supply for the anti-electric shock socket according to the detected voltage, thereby helping to cut off the power supply in time when leakage occurs and effectively avoid electric shock.

[0043] Specifically, Figures 2 to 4 As shown, the voltage detection circuit 4 (such as Figure 2) includes: a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, a Zener diode Z1, a first transistor Q1 and a second transistor Q2.

[0044] The first end of the first capacitor C1 is connected to the neutral wire connection member 3, the first end of the first resistor R1 and the first end of the second resistor R2. The second end of the first capacitor C1 is connected to the ground wire connection member 2, the second end of the first resistor R1, the second end of the third resistor R3, the emitter of the first transistor Q1, the emitter of the second transistor Q2 and the output end of the voltage detection circuit; the second end of the second resistor R2 is connected to the cathode of the Zener diode Z1; the anode of the Zener diode Z1 is connected to the first end of the third resistor R3, the first end of the fourth resistor R4 and the base of the first transistor Q1; the second end of the fourth resistor is connected to the collector of the first transistor Q1, the base of the second transistor Q2 and the collector of the second transistor Q2. Among them, the first transistor Q1 and the second transistor Q2 are both NPN transistors.

[0045] When the voltage detection circuit is working, if the socket leaks, there is a voltage between the neutral wire connector and the ground wire connector, and the first capacitor C1 is charged. When the voltage between the neutral wire connector and the ground wire connector reaches the reverse breakdown voltage of the Zener diode Z1 (at this time, it is believed that the voltage will cause an electric shock to a person who touches the socket), current flows through the third resistor R3, and a voltage is generated on the third resistor R3. The first transistor Q1 is turned on, and the base of the second transistor Q2 is pulled down to the ground, so the transistor Q2 is not turned on and a high voltage signal is output.

[0046] If there is no leakage in the socket, there is no voltage between the neutral wire connector and the ground wire connector, and the Zener diode Z1 will not be reversely broken down. Therefore, the first transistor Q1 is turned off and the second transistor Q2 is turned on. Since the output end of the voltage detection circuit is pulled down to the ground, the output is a low voltage signal.

[0047] The control module adopts a single chip microcomputer, such as an AT89C51 single chip microcomputer, and the single chip microcomputer receives a high voltage signal or a low voltage signal sent by a voltage detection circuit.

[0048] like Figure 3 As shown, the power cut-off circuit includes: a fifth resistor R5, a third transistor Q3, and a first relay KR1, a second relay KR2 and a third relay KR3.

[0049] A first end of the fifth resistor R5 is connected to the single chip microcomputer; a second end of the fifth resistor R5 is connected to the base of the third transistor Q3; and an emitter of the third transistor Q3 is grounded.

[0050] The collector of the third transistor Q3 is connected to the first end of the coil K1 of the first relay KR1, the first end of the coil K2 of the second relay KR2 and the first end of the coil K3 of the third relay KR3;

[0051] A second end of the coil K1 of the first relay KR1 , a second end of the coil K2 of the second relay KR2 , and a second end of the coil K3 of the third relay KR3 are all connected to the power source Vcc.

[0052] The live wire, neutral wire and ground wire of the mains power supply for the electric shock prevention socket are connected to the live wire connection piece, neutral wire connection piece and ground wire connection piece through the switch S1 of the first relay KR1, the switch S2 of the second relay KR2 and the switch S3 of the third relay KR3 respectively. Among them, the third transistor Q3 also adopts an NPN transistor.

[0053] When in use, when the single-chip microcomputer receives a high voltage signal, it outputs current to the power cut-off circuit, so that a high level appears on the third transistor Q3, the third transistor is turned on, and the first relay KA1, the second relay KA2 and the third relay KA3 are energized and activated. In this embodiment, the first relay KA1, the second relay KA2 and the third relay KA3 are all normally closed relays. When the relay is energized, the switches S1, S2 and S3 are disconnected, and then the power supply of the AC power to the socket is disconnected, thereby realizing timely power cut-off and avoiding the risk of electric shock.

[0054] The same and similar parts between the various embodiments in this specification can be referenced to each other.

[0055] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0056] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For maintenance personnel in this field, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An anti-electric shock socket, comprising: The socket body and the ground wire connector, the neutral wire connector and the live wire connector arranged on the socket body are characterized in that a voltage detection circuit, a control module and a power cut-off circuit are also arranged in the socket body; The input end of the voltage detection circuit is connected to the ground wire connection piece and the neutral wire connection piece to detect the leakage voltage between the ground wire connection piece and the neutral wire connection piece and output detection information; The control module is connected to the output end of the voltage detection circuit to receive and process the detection information; The power cut-off circuit is arranged between the mains power supply and the live wire, the neutral wire and the ground wire connected to the ground wire connector, the neutral wire connector and the live wire connector to cut off the mains power supply; The control module is connected to the power cut-off circuit to control the power cut-off circuit to cut off the power supply of the electric shock socket.

2. The anti-electric shock socket according to claim 1, characterized in that: The voltage detection circuit includes: a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a Zener diode Z1, a first transistor Q1 and a second transistor Q2; A first end of the first capacitor C1 is connected to the neutral line connection member, a first end of the first resistor R1 and a first end of the second resistor R2; The second end of the first capacitor C1 is connected to the ground wire connection piece, the second end of the first resistor R1, the second end of the third resistor R3, the emitter of the first transistor Q1, the emitter of the second transistor Q2 and the output end of the voltage detection circuit; The second end of the second resistor R2 is connected to the cathode of the Zener diode Z1; the anode of the Zener diode Z1 is connected to the first end of the third resistor R3, the first end of the fourth resistor R4 and the base of the transistor Q1; the second end of the fourth resistor R4 is connected to the collector of the first transistor Q1, the base of the second transistor Q2 and the collector of the second transistor Q2.

3. The anti-electric shock socket according to claim 1, characterized in that: The power cut-off circuit comprises: a fifth resistor R5, a third transistor Q3, a first relay KR1, a second relay KR2 and a third relay KR3; A first end of the fifth resistor R5 is connected to the control module; a second end of the fifth resistor R5 is connected to the base of the third transistor Q3; and an emitter of the third transistor Q3 is grounded; The collector of the third transistor Q3 is connected to the first end of the coil K1 of the first relay KR1, the first end of the coil K2 of the second relay KR2 and the first end of the coil K3 of the third relay KR3; The second end of the coil K1 of the first relay KR1, the second end of the coil K2 of the second relay KR2 and the second end of the coil K3 of the third relay KR3 are all connected to the power supply Vcc; The live wire, neutral wire and ground wire of the AC power supply for the electric shock protection socket are connected to the live wire connection piece, neutral wire connection piece and ground wire connection piece through the switch S1 of the first relay KR1, the switch S2 of the second relay KR2 and the switch S3 of the third relay KR3 respectively.

4. The anti-electric shock socket according to claim 1, characterized in that: The control module adopts a single chip microcomputer.

5. The anti-electric shock socket according to claim 2, characterized in that: The first transistor Q1 and the second transistor Q2 are both NPN transistors.

6. The anti-electric shock socket according to claim 3, characterized in that: The first relay KR1, the second relay KR2 and the third relay KR3 are all normally closed electric contact relays.

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