CN2777814Y

CN2777814Y - Electricity prevention wall device with ground wire failure protection function for food processor

Info

Publication number: CN2777814Y
Application number: CN 200520100568
Authority: CN
Inventors: 谭启仁
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-02-06
Filing date: 2005-02-06
Publication date: 2006-05-03
Anticipated expiration: 2015-02-06

Abstract

The utility model discloses an electricity prevention wall device with an earth wire failure protection function for food processors, which belongs to the field of the control technique of a single chip computer, particularly to the electricity prevention wall technique which can cut off the earth wire with electricity in real time when the earth wire of a food processor and the basic insulation fail simultaneously. The utility model is composed of a null and earth wire electrical potential difference detecting device and a switch executive circuit which are connected. The utility model is characterized in that the voltage of the null and earth wire electrical potential difference detecting device is reduced by a transformer or a resistor which is bridged between the null wire and the earth wire, the null and earth wire electrical potential difference detecting device is rectified by a diode and is connected with a base electrode of a switch tube after voltage stabilization by the resistor and a voltage stabilizing tube, a collecting electrode of the switch tube is connected with the input terminal of the single chip computer, the output terminal of the single chip computer is connected with a coil of a relay, and a normally closed contact of the relay is connected with the earth wire and a fire wire. The aim of the electricity prevention wall technique provided by the utility model is to cut off the earth wire and a power supply of the food processor in real time when the earth wire of the food processor has electricity, namely, to protect personal safety under the condition of unreliable earthing or failure of the earth wire.

Description

Food processor electricity-preventing wall device with earth wire failure protection function

Technical field belongs to the single-chip microcomputer control technology field, can cut off the anti-electric wall technology of charged ground wire when particularly food processor ground wire and basic insulation lost efficacy simultaneously in real time.

Before background technology the utility model applying date, food processor does not have ground connection and the basic insulation personal safety protector when losing efficacy simultaneously, the personal safety protector when yet not having ground wire electrification.

The summary of the invention the purpose of this utility model just provides a kind of food processor electricity-preventing wall device with earth wire failure protection function.

The technical scheme that its technical problem that solves the utility model adopts is: have ground wire and zero line potential difference detecting device, the detection signal of single-chip microcomputer is taken from the potential difference signal between ground wire and zero line.Zero grounding potential difference detector set is by transformer or the capacitance-resistance device step-down of cross-over connection between zero line and ground wire, diode rectification, be connected with the base stage of switching tube after capacitance-resistance and the voltage-stabiliser tube voltage stabilizing, the collector electrode of switching tube is connected with the single-chip microcomputer input, the single-chip microcomputer output is connected with relay coil, and the relay normally-closed contact connects ground wire and live wire.

The beneficial effects of the utility model are: the anti-electric wall technology that the invention relates to, cut off in real time ground wire and food when being intended to the food processor ground wire electrification and add dynamo-electric source, promptly ground connection under the unreliable or earth wire failure environment to personal safety protection.

Description of drawings Fig. 1 is a circuit structure block diagram of the present utility model.

Fig. 2 is an electrical schematic diagram of the present utility model.

Embodiment is consulted Fig. 1.Form by the potential difference detection transducer (1), single chip machine controlling circuit (shared) (2) and the electronic switch control circuit (3) that are connected across between ground wire and zero line with the food processor control circuit.

Consult Fig. 2.Potential difference between ground wire and zero line detects transducer by transformer T, diode D ₁~ D ₄And triode 9013 is formed also available resistance-capacitance depressurization circuit R ₁C ₁, D ₁~ D ₄Form.Electronic switch is by one group or two group 9013, relay J ₁, J ₂Form.Be connected across the detection signal input single-chip processor i/o end of the potential difference detection transducer between ground wire and zero line.Single-chip microcomputer output I/O signal controlling triode.Triode conducting during the I/O high level, the actuating of relay, on the contrary relay is failure to actuate.The normal-closed end of relay is serially connected on ground wire or ground wire, the live wire, and the break-make of the keying of relay control ground wire, live wire also is controlled by single-chip microcomputer.

Claims

1, a kind of food processor electricity-preventing wall device with earth wire failure protection function is characterized in that having ground wire and zero line potential difference detecting device, and the detection signal of single-chip microcomputer is taken from the potential difference signal between ground wire and zero line.

2, the food processor electricity-preventing wall device with earth wire failure protection function according to claim 1; it is characterized in that zero grounding potential difference detector set is by transformer or the capacitance-resistance device step-down of cross-over connection between zero line and ground wire; diode rectification; be connected with the base stage of switching tube after capacitance-resistance and the voltage-stabiliser tube voltage stabilizing; the collector electrode of switching tube is connected with the single-chip microcomputer input; the single-chip microcomputer output is connected with relay coil, and the relay normally-closed contact connects ground wire and live wire.