CN201387560Y

CN201387560Y - Heat-preservation control circuit of electric pressure cooker

Info

Publication number: CN201387560Y
Application number: CN200920055077U
Authority: CN
Inventors: 戴宇波
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-04-21
Filing date: 2009-04-21
Publication date: 2010-01-20
Anticipated expiration: 2019-04-21

Abstract

The utility model relates to the field of automatic control of an electric pressure cooker, in particular to a heat-preservation control circuit of the electric pressure cooker. The heat-preservation control circuit comprises an MCU (micro controller unit), a temperature measuring circuit and a heating control circuit. The output end of the temperature measuring circuit is connected with the input end of the MCU, and the output end of the MCU is connected with the input end of the heating control circuit. The MCU comprises a temperature judging comparison module which can control the heating of the heating control circuit according to the temperature measured by the temperature measuring circuit. When the temperature of the temperature judging comparison module in the cooker is lower than the set value, the MCU can drive the heating control circuit to carry out heating. The heat-preservation control circuit can automatically make sure the temperature in the cooker is kept at a constant temperature value, is beneficial for heat preservation for food in the cooker, and can ensure the taste of the food.

Description

A kind of electric pressure cooking saucepan preservation and controlling circuit

Technical field

The utility model relates to the electric pressure cooking saucepan automation field, particularly a kind of electric pressure cooking saucepan preservation and controlling circuit.

Background technology

The circuit of electric pressure cooking saucepan can be realized the control to the electric pressure cooking saucepan duty, at different food materials, different cooking methods, the control of electric pressure cooking saucepan circuit generally has different function settings: such as the setting of working time can require to set the different working times according to different food; But existing electric pressure cooking saucepan circuit control device still lacks the realization to heat insulation function under the high-pressure work state.

In fact, after electric pressure cooking saucepan is worked under high-temperature high-pressure state, food will be deposited certain hour toward contact in pot, if this moment, electric pressure cooking saucepan quit work, may make that then food temperature is reduced to room temperature, influence mouthfeel, and if still keep keeping in the pot temperature of duty, food can be well-done, and the while is electricity wasting also.

The utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of electric pressure cooking saucepan preservation and controlling circuit that can be incubated to electric pressure cooking saucepan under high pressure conditions is provided.

In order to realize above-mentioned technical purpose, the utility model comprises following technical characterictic: a kind of electric pressure cooking saucepan preservation and controlling circuit, comprise single-chip microcomputer, temperature measurement circuit and heating control circuit, and the output terminal of described temperature measurement circuit is connected with the single-chip microcomputer input end; Described single-chip microcomputer output terminal is connected with the input end of heating control circuit, and described single-chip microcomputer comprises that the temperature that the temperature level control heating control circuit that records according to temperature measurement circuit heats judges comparison module under high pressure conditions.

Described temperature measurement circuit comprises thermistor Rt, build-out resistor Rj1 and the pull down resistor RJ2 that is used to measure kettle temperature; A described thermistor Rt and a termination power after build-out resistor Rj1 is in parallel, the other end are connected with single-chip microcomputer and by pull down resistor RJ2 ground connection.

Further, described heating control circuit comprises triode Q1, triode Q3, electromagnetic relay RY1, pressure switch SW; The power supply of described pressure switch SW one termination electromagnetic relay RY1, its other end is connected with single-chip microcomputer by triode Q3, and is connected with the solenoid joint of electromagnetic relay RY1; Another solenoid joint of electromagnetic relay RY1 is connected with the collector of triode Q1; The base stage of triode Q1 is connected with single-chip microcomputer; The emitter grounding of triode Q1.

Described single-chip microcomputer is connected with the key circuit that is used for input of control commands.

Described single-chip microcomputer is connected with the buzzing control circuit.

The utility model compared with prior art has following beneficial effect: single-chip microcomputer comprises the temperature level that an energy records according to temperature measurement circuit, the temperature that the control heating control circuit heats under pot inner high voltage state is judged comparison module, therefore can guarantee that the driving heating control circuit heats when kettle temperature during less than setting value.Because when this temperature can keep the pot inner high voltage, therefore realized the heat insulation function under high pressure conditions, this state helps guaranteeing that food never degenerates, and keeps taste.

Description of drawings

Accompanying drawing 1 is a module connection layout of the present utility model;

Accompanying drawing 2 comprises the circuit catenation principle figure of single chip part for the utility model;

Accompanying drawing 3 comprises the circuit catenation principle figure of temperature measurement circuit and heating control circuit part for the utility model.

Embodiment

Below in conjunction with Figure of description embodiment of the present utility model is elaborated.

Accompanying drawing 1 is a module connection layout of the present utility model, comprises single-chip microcomputer 1, temperature measurement circuit 2 and heating control circuit 3, and the output terminal of described temperature measurement circuit 2 is connected with single-chip microcomputer 1 input end; Described single-chip microcomputer 1 output terminal is connected with the input end of heating control circuit 3, and described single-chip microcomputer 1 comprises the temperature judgement comparison module of temperature level control heating control circuit 3 heating that record according to temperature measurement circuit 2.

Accompanying drawing 2 is the circuit catenation principle figure of the utility model single-chip microcomputer, single-chip microcomputer 1 in this specific embodiment is chip S3F9454, described temperature judges that comparison module is to finish by the singlechip chip inner setting, temperature judges that the function of comparison module is that the temperature level that records according to temperature measurement circuit 2 and the holding temperature of setting compare, when recording temperature less than holding temperature, output signal makes the monolithic function drive heating control circuit 3 heating, otherwise output stops heating signal.The setting of this holding temperature can be a default setting, also can be to be set up on their own by the client, and this holding temperature value can guarantee to keep high pressure in the pot in the utility model, as 100 degrees centigrade, has promptly realized the heat insulation effect under pot inner high voltage state this moment.

Accompanying drawing 3 is the circuit catenation principle figure of temperature measurement circuit 2 and heating control circuit 3.

Described temperature measurement circuit 2 comprises thermistor Rt, build-out resistor Rj1 and the pull down resistor RJ2 that is used to measure kettle temperature; A described thermistor Rt and a termination power after build-out resistor Rj1 is in parallel, the other end are connected with single-chip microcomputer 1 and by pull down resistor RJ2 ground connection.Described thermistor Rt is a negative tempperature coefficient thermistor, and resistance value changes along with variation of temperature.Described build-out resistor Rj1=2M ohm, pull down resistor RJ2=5.6K ohm.Temperature measurement circuit 2 becomes the resistance value conversion of signals of different temperatures correspondence the voltage signal of input single-chip microcomputer.

Described heating control circuit 3 comprises triode Q1, triode Q3, electromagnetic relay RY1, pressure switch SW; The power supply of described pressure switch SW one termination electromagnetic relay RY1, its other end is connected with single-chip microcomputer 1 by triode Q3, and is connected with the solenoid joint of electromagnetic relay RY1; Another solenoid joint of electromagnetic relay RY1 is connected with the collector of triode Q1; The base stage of triode Q1 is connected with single-chip microcomputer 1; The emitter grounding of triode Q1.Because pressure switch SW is concatenated on the power supply of electromagnetic relay RY1, when pressure cooker single-chip microcomputer 1 lost efficacy or the generation entanglement, when causing the relay control of single-chip microcomputer mouthful allow the long output of relay R YL1 by Q1, if pressure is excessive, because pressure switch disconnects at this moment, described relay R YL1 loses the relay power supply of 12V, forces to allow relay R YL1 cut off the power supply, thereby allow the heat-generating disc of pressure cooker not work, avoid the too high generation of pot inner pressure dangerous.This be equivalent to make pressure cooker many again a heavily protection, it is safer that the user is used.

Claims

1, a kind of electric pressure cooking saucepan preservation and controlling circuit comprises single-chip microcomputer (1), temperature measurement circuit (2) and heating control circuit (3), and the output terminal of described temperature measurement circuit (2) is connected with single-chip microcomputer (1) input end; Described single-chip microcomputer (1) output terminal is connected with the input end of heating control circuit (3), it is characterized in that: described single-chip microcomputer (1) comprises that the temperature that the temperature level control heating control circuit (3) that records according to temperature measurement circuit (2) heats judges comparison module under high pressure conditions.

2, electric pressure cooking saucepan preservation and controlling circuit according to claim 1 is characterized in that: described temperature measurement circuit (2) comprises thermistor Rt, build-out resistor Rj1 and the pull down resistor RJ2 that is used to measure kettle temperature; A described thermistor Rt and a termination power after build-out resistor Rj1 is in parallel, the other end are connected with single-chip microcomputer (1) and by pull down resistor RJ2 ground connection.

3, electric pressure cooking saucepan preservation and controlling circuit according to claim 1, it is characterized in that: described heating control circuit (3) comprises triode Q1, triode Q3, electromagnetic relay RY1, pressure switch SW; The power supply of described pressure switch SW one termination electromagnetic relay RY1, its other end is connected with single-chip microcomputer (1) by triode Q3, and is connected with the solenoid joint of electromagnetic relay RY1; Another solenoid joint of electromagnetic relay RY1 is connected with the collector of triode Q1; The base stage of triode Q1 is connected with single-chip microcomputer (1); The emitter grounding of triode Q1.

4, according to each described electric pressure cooking saucepan preservation and controlling circuit of claim 1 ~ 3, it is characterized in that: described single-chip microcomputer (1) is connected with the key circuit that is used for input of control commands.

5, according to each described electric pressure cooking saucepan preservation and controlling circuit of claim 1 ~ 3, it is characterized in that: described single-chip microcomputer (1) is connected with the buzzing control circuit.