CN2775511Y

CN2775511Y - Shock-proof power saving control device for microwave oven

Info

Publication number: CN2775511Y
Application number: CN 200520100182
Authority: CN
Inventors: 谭启仁
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-01-18
Filing date: 2005-01-18
Publication date: 2006-04-26
Anticipated expiration: 2015-01-18

Abstract

The utility model relates to a shock-proof power-saving control device of a microwave oven, which belongs to the application of SCM technology in the field of household appliance control. The shock-proof power-saving control device comprises an SCM and an actuating mechanism and is characterized in that an input terminal of the SCM is connected with an earth wire electrification detecting device, and an output terminal of the SCM is connected with an electric heater controlling circuit of the microwave oven. The controlling circuit comprises a switching tube and a relay. A normally open contact of the relay is connected with an inlet wire and an outlet wire of a power supply in series. A zero-earth wire detecting device is connected with the base electrode of the switching tube through the voltage reduction of the transformer or a resistance-capacitor which is connected between a zero wire and an earth wire in a crossover way. An hour setting button, a minute setting button and a night electricity setting button are arranged in the control device of microwave oven. The utility model can control the microwave oven to operate in a valley electricity time interval, which is favorable for the full utilization of valley electricity and resource saving. At the same time, when the earth wire is electrified, the utility model can cut off an earth wire and a power supply of the microwave oven in real time, and thus, under the circumstance that earhing is unreliable, or the earth wire fails, the utility model can protect a user's personal safety. The utility model is used in the control devices of machines or electronic microwave ovens.

Description

A kind of effective safety controller of microwave oven

Technical field the invention belongs to the singlechip technology electric control Application for Field of being in.

Before background technology the invention applying date, no matter micro-wave oven is that machinery control or Electronic Control are not all established the night letter key, it is the period work of paddy electricity in the night letter period automatically that micro-wave oven is not had, use the paddy electricity to make troubles for the user that the peak valley ammeter is housed, also national paddy section electric power resource is not fully utilized.Simultaneously because the earth wire charged protecting that product lacks pipe ground wire and basic insulation when losing efficacy simultaneously brings hidden danger for user's safety.

The purpose of summary of the invention the invention provides a kind of effective safety controller of microwave oven.

The invention solves the technical scheme that its technical problem adopts: comprise single-chip microcomputer and executing agency, the single-chip microcomputer input is connected with earth wire charged testing device, the single-chip microcomputer output is connected with micro-wave oven electric heater control circuit, this control circuit comprises switching tube and relay composition, the inlet wire and the outlet of the normally opened contact serial connection power supply of relay, zero earth line test device is by transformer or the resistance-capacitance depressurization of cross-over connection between zero line and ground wire, be connected with the base stage of switching tube after diode rectification and the voltage stabilizing, in the micro-wave oven control device, be provided with key hour is set, minute key is set and night letter is provided with key.Mu balanced circuit and switching tube that earth wire charged testing device is made up of transformer or resistance-capacitance depressurization circuit, diode rectification and voltage-stabiliser tube are formed, and its input cross-over connection is between zero-power line and ground wire, and its output is connected with the single-chip microcomputer input.Hour, minute are set in the micro-wave oven control device key and night letter key are set, be connected with the single-chip processor i/o input port respectively, the single-chip processor i/o output port connects on-off circuit, and on-off circuit connects the switch executive circuit, and the normally opened contact of switch executive circuit connects microwave oven supply power.

The beneficial effect of the invention is: the invention can be controlled micro-wave oven in the period work of paddy electricity; help making full use of paddy; economize on resources; have simultaneously when ground wire electrification and can cut off ground wire and microwave oven supply power in real time; promptly ground connection under the unreliable or earth wire failure environment to personal safety protection, be widely used in machinery or the microwave oven control device.

Description of drawings Fig. 1 is the electrical schematic diagram of the invention.Single-chip microcomputer is a 8-bit microcontroller among the figure, adopts the PIC16C57 of U.S. MICROCHIP company.E _INBe ground wire end of incoming cables, E _OUTBe ground wire leading-out terminal, L _INBe live wire end of incoming cables, L _OUTBe the live wire leading-out terminal, N is a zero line, and 12V is the 12V dc source.G ₁, G ₂Be switching tube, J ₁, J ₂Be relay, K ₁Be a hour key, K ₂Be a minute key, K is the night letter key.T is power transformer, R ₁C ₁Be capacitance-resistance device, D ₁～D ₄Be rectifying tube, DW is a voltage-stabiliser tube 7805, Q ₀Be switching tube 9013.Capacitor C ₀

The specific embodiment is consulted Fig. 1.Cross-over connection is in zero line N and ground wire E _INBetween potential difference detecting device by transformer T or capacitance-resistance R ₁C ₁(among the figure shown in the dotted line) step-down, D ₁～D ₄Diode rectification, capacitor C ₀, voltage-stabiliser tube the DW mu balanced circuit and the switching tube Q that form ₀Form switching tube Q ₀Be connected in the single-chip processor i/o input port, I/O output port gauge tap executive circuit Q ₁, Q ₂, J ₁, J ₂The relay normally-closed contact connects ground wire E _INAnd E _OUT, normally opened contact connects micro-wave oven live wire L _INAnd L _OUTHour key K ₁, minute key K ₂And night letter key K is connected with the I/O input of single-chip microcomputer respectively.LCD is that liquid crystal display is connected with the single-chip processor i/o output.

Claims

1, a kind of effective safety controller of microwave oven, comprise single-chip microcomputer and executing agency, it is characterized in that the single-chip microcomputer input is connected with earth wire charged testing device, the single-chip microcomputer output is connected with micro-wave oven electric heater control circuit, this control circuit comprises switching tube and relay composition, the inlet wire and the outlet of the normally opened contact serial connection power supply of relay, zero earth line test device is by transformer or the resistance-capacitance depressurization of cross-over connection between zero line and ground wire, be connected with the base stage of switching tube after diode rectification and the voltage stabilizing, in the micro-wave oven control device, be provided with key hour is set, minute key is set and night letter is provided with key.

2, a kind of effective safety controller of microwave oven according to claim 1, it is characterized in that mu balanced circuit and switching tube that earth wire charged testing device is made up of transformer or resistance-capacitance depressurization circuit, diode rectification and voltage-stabiliser tube form, its input cross-over connection is between zero-power line and ground wire, and its output is connected with the single-chip microcomputer input.

3, a kind of effective safety controller of microwave oven according to claim 1, it is characterized in that being provided with in the micro-wave oven control device hour, minute key and night letter key are set, be connected with the single-chip processor i/o input port respectively, the single-chip processor i/o output port connects on-off circuit, on-off circuit connects the switch executive circuit, and the normally opened contact of switch executive circuit connects microwave oven supply power.