CN201028804Y - 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 it has a zero-ground potential difference detection device and a fire-ground potential difference detection device, which are respectively connected with the input terminal 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 rectifier circuit, a voltage stabilizing circuit and a switch circuit. between. 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, and the contacts of the relay are respectively connected with the input and output terminals of the live wire, the neutral wire and the ground wire. The input terminal of the single-chip microcomputer has the function of time-sharing detection and the output terminal of the single-chip microcomputer has the function of polarity conversion, so as 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 unreliable, so as to play a role of safety protection and protect the electric water heater. Polarity conversion is performed when the input polarities of live wire and neutral wire are reversed.

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

Before the application date of this utility model, the thermal storage electric water heater did not have the function of polarity conversion and the protection function of personal safety in the case 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 solution adopted by the utility model to solve its technical problems is: the electric water heater anti-electricity device with time-sharing detection function includes a single-chip microcomputer input and output circuit; a zero-ground potential difference detection device and a fire-ground potential difference detection device are installed, respectively Connect with the input terminal of the single chip microcomputer. The zero-ground potential difference detection device and the fire-ground potential difference detection device are composed of a rectifier circuit, a voltage stabilizing circuit and a switch circuit. The switch circuit includes an operational amplifier circuit and a time base circuit, which are respectively connected between the zero ground and the fire In between, the rectifier circuit includes a voltage limiting circuit and a diode bridge rectifier circuit. 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, and the contacts of the relay are respectively connected with the input and output ends of the live wire, the neutral wire and the ground wire. The alarm luminescent tube and the alarm sounder are connected with the output end of the single-chip microcomputer.

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 , play the role of security protection. Make sure to perform polarity conversion when the input polarities of the live wire L and the neutral wire N of the electric water heater are reversed. The single-chip microcomputer can share resources with the original electric water heater control circuit single-chip microcomputer, and can save cost compared with a single electric water heater anti-electricity device.

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 to the input terminals I/O (1) and I/O (2) of the single-chip microcomputer PIC16C54. The zero-to-ground potential difference detection device and the fire-to-ground potential difference detection device are composed of a rectifier circuit, a voltage stabilizing circuit and a switch circuit. between ground and LE. The rectification circuit includes a voltage limiting circuit T1, a diode bridge rectification circuit D1-D4, a voltage limiting circuit T2, and a diode bridge rectification circuit D5-D8.

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. The alarm luminescent tube D and the alarm sounder SP are connected with the output terminals I/O (6) and I/O (7) of the single-chip microcomputer.

Claims (4)

1. An electric water heater anti-electricity device with a time-sharing detection function, comprising 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 connected with the single-chip microcomputer input respectively. 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 rectifier circuit, a voltage stabilizing circuit and a switch circuit The switch circuit includes an operational amplifier circuit and a time base circuit, which are respectively connected between the neutral ground and the fire ground, and the rectification circuit includes a voltage limiting circuit and a diode bridge rectification circuit. 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 contacts of the relay are respectively Connect to the input and output ends of live wire, neutral wire and ground wire. 4. The electric water heater anti-electricity device with time-sharing detection function according to claim 1, characterized in that: the alarm light tube and the alarm sounder are connected to the output end of the single-chip microcomputer.

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