CN201106932Y - Anti-electricity device for electric water heater with time-sharing detection function - Google Patents

Abstract

An anti-electricity device for an electric water heater with a time-sharing detection function relates to an anti-electricity device for an electric water heater; it is characterized in that a zero-to-ground potential difference detection device and a fire-to-ground potential difference detection device are connected across the zero-to-ground wire and the fire-to-ground wire respectively Between the fire and ground wires, the output terminals are respectively connected with the input terminals of the single-chip microcomputer. The voltage stabilizing circuit of the zero-to-ground potential difference detection device and the fire-to-ground potential difference detection device includes a transformer circuit and a rectifier circuit. The switch circuit includes a switch tube and a relay. The switch tube is connected to the relay. The positive pole of the power supply is connected, and the other end is respectively connected with the input end of the single-chip microcomputer. The output end of the single-chip microcomputer is connected with the switch tube and the relay, and the normally open contacts of the relay are respectively connected with the input and output ends of the live wire, the neutral wire and the ground wire. Its beneficial effect is to ensure that the live wire, neutral wire and ground wire are cut off when the ground wire of the electric water heater is charged and unreliably grounded, and the polarity conversion is performed when the polarity of the input power is reversed, so as to play a role of safety protection.

Description

Anti-electricity device for electric water heater with time-sharing detection function

technical field

The utility model relates to an anti-electricity device for an electric water heater, in particular to an anti-electricity device for an electric water heater with a time-sharing detection function, and belongs to the technical field of single-chip microcomputer control.

Background technique

The prior art of the thermal storage electric water heater does not have the function of polarity conversion and the protection function of personal safety under the condition of electrified ground wire and unreliable grounding.

Contents of the invention

The purpose of the utility model is to provide an electric water heater anti-electricity device with a time-sharing detection function.

The technical scheme adopted by the utility model to solve its technical problems is: the device includes a single-chip microcomputer input and output circuit; the zero-ground potential difference detection device and the fire-ground potential difference detection device are respectively connected between the zero-ground wire and the fire-ground wire The output terminals are respectively connected to the input terminals of the single-chip microcomputer. The zero-to-ground potential difference detection device and the fire-to-ground potential difference detection device are composed of a voltage stabilizing circuit and a switching circuit. The voltage stabilizing circuit includes a voltage transformer circuit and a diode bridge rectifier circuit. The switching circuit includes a switching tube and a relay, and a switching tube and a relay. One end of the normally open contact of the relay is connected to the positive pole of the power supply, and the other end is respectively connected to the input end of the single-chip microcomputer. The output end of the single-chip microcomputer is connected with the switch execution circuit, and the switch execution circuit is composed of a switch tube and a relay.

The beneficial effect of the utility model is that the input end of the single-chip microcomputer has a time-sharing detection function and the output end of the single-chip microcomputer has a polarity conversion function, so as to ensure that the live wire L, the neutral wire N and the ground wire E are cut off when the ground wire of the electric water heater is charged and unreliably grounded , to ensure that the polarity conversion is performed when the input polarities of the live wire L and the neutral wire N of the electric water heater are reversed, which plays a role of safety protection.

Description of drawings

Below by accompanying drawing, the utility model will be further described.

Accompanying drawing 1 is the electrical schematic diagram of the utility model.

Detailed ways

See Figure 1. The single-chip microcomputer in the picture is PIC16C54 eight-bit single-chip microcomputer of American Microchip Company.

The zero-to-ground potential difference detection device and the fire-to-ground potential difference detection device are respectively connected between the zero-ground wire NE and the fire-to-ground wire LE, and their output terminals are respectively connected to the input terminals I/O (1), I/O of the single-chip microcomputer PIC16C54 (2) connected. The zero-to-ground potential difference detection device and the fire-to-ground potential difference detection device are composed of a voltage stabilizing circuit and a switch circuit. Including switching tubes VT1, VT2 and relays J1, J2, switching tubes VT1, VT2 are connected to relays J1, J2, one end of the normally open contacts of relays J1, J2 is connected to the positive pole (+) of the power supply, and the other end is respectively connected to the single chip microcomputer PIC16C54 The input terminals I/O(1) and I/O(2) are connected together. The single chip microcomputer PIC16C54 I/O output terminal I/O (3), I/O (4), I/O (5) is connected with the switch execution circuit, and the switch execution circuit is composed of switch tubes G1, G2, G3 and relays J1, J2, Composed of J3, the contacts of the relay are respectively connected to the input and output ends of the live wire L, the neutral wire N and the ground wire E.

Claims (3)

1. An anti-electricity device for an electric water heater with a time-sharing detection function, including a single-chip microcomputer input and output circuit; it is characterized in that a zero-ground potential difference detection device and a fire-ground potential difference detection device are respectively connected across the zero-ground wire and the fire wire. Between the ground wires, the output terminals are respectively connected with the input terminals of the single-chip microcomputer. 2. The electric water heater anti-electricity device with time-sharing detection function according to claim 1, characterized in that: the zero-ground potential difference detection device and the fire-ground potential difference detection device are composed of a voltage stabilizing circuit and a switching circuit. The voltage circuit includes a transformer circuit and a diode bridge rectifier circuit. The switch circuit includes a switch tube and a relay. . 3. The electric water heater anti-electricity device with time-sharing detection function according to claim 1, characterized in that: the output terminal of the single chip microcomputer is connected with the switch execution circuit, the switch execution circuit is composed of a switch tube and a relay, and the normally open contact of the relay The points are connected to the inlet and outlet ends of live wire, neutral wire and ground wire respectively.

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