CN201167849Y - An intelligent control circuit for an electric heating kettle - Google Patents

Abstract

An intelligent control circuit for an electric boiling water pot is characterized in that a pressure switch is installed at the bottom of the container and connected to the input end of a single-chip microcomputer, and the pressure switch is adjusted to close when the container has more than 0.5 liters of water. The input terminals of the single-chip microcomputer are respectively connected with a group of light touch keys, the zero-ground potential difference detection circuit, the live wire and zero-line current difference detection circuit and the A/D temperature control circuit, and the output terminals of the single-chip microcomputer are respectively connected with the liquid crystal display, light-emitting diodes and triodes. The switch circuit is connected, and the relay contacts connected with the triode switch circuit are respectively connected with the input and output ends of the live wire, the neutral wire and the ground wire connected to the electric heating tube. The beneficial effect is that the power supply of the electric heating tube can only be turned on when there is more than 0.5 liter of water in the container of the electric heating boiling water kettle, which can effectively prevent the occurrence of accidents such as dry heating. The electric boiling water kettle has temperature setting and control functions, which brings convenience to users who need different water temperatures. The electric boiling water boiler is equipped with an anti-electricity device, which brings a safe environment for users to use electricity.

Description

An intelligent control circuit for an electric heating kettle

technical field

The utility model relates to a control circuit, in particular to an intelligent control circuit for an electric heating kettle.

Background technique

Before the application date of the utility model, the electric heating water boiler had the following defects: the electric heating water boiler required that the electric heating tube must have water in the container when heating, and dry heating was strictly prohibited. The electric heating tube of the electric heating kettle in the prior art does not control the power supply, and the power can be turned on regardless of whether there is water in the container. However, when the container is dry, the electric heating tube is turned on for heating, which may easily cause accidents such as dry burning. The electric boiling water kettle of the prior art has no temperature setting, temperature display and control functions, which brings inconvenience to users who need different water temperatures. The electric heating kettle of the prior art does not have an anti-electricity device, which brings unsafe factors of electricity consumption to users.

Contents of the invention

The purpose of the utility model is to provide an intelligent control circuit for an electric heating kettle.

The technical scheme adopted by the utility model to solve the technical problem is: comprising a pressure switch and a single-chip microcomputer input and output circuit, characterized in that the pressure switch is installed at the bottom of the container, one end of the pressure switch is connected to the I/O input end of the single-chip microcomputer, and the other end is grounded. The pressure switch is adjusted until the container has more than 0.5 liters of water, and the pressure switch is closed. The I/O input terminal of the microcontroller is connected with a set of light touch keys, the zero-ground potential difference detection circuit, the live wire and zero wire current difference detection circuit, and A/D temperature control. The circuit is connected, the I/O output terminal of the single chip microcomputer is respectively connected with the liquid crystal display, the light-emitting diode, and the triode switch circuit, and the relay contacts connected with the triode switch circuit are respectively connected with the live wire, neutral wire and ground wire of the electric heating tube. The inlet and outlet are connected. The zero-ground potential difference detection circuit is composed of transformers, rectifier tubes, voltage regulator tubes, voltage regulator capacitors, and Darlington tubes connected step by step between the ground wire and the neutral line. The output terminal of the Darlington tube is connected to the I/O O input is connected. The live wire and neutral wire current difference detection circuit is composed of a dual operational amplifier integrated circuit connected to a magnetic ring coil, the live wire and neutral wire pass through the magnetic ring coil, and the dual operational amplifier integrated circuit is connected to the I/O input terminal of the single-chip microcomputer.

The beneficial effect of the utility model is to ensure that the electric heating tube power supply can only be turned on when there is more than 0.5 liters of water in the electric heating kettle. In the case of no water in the container, the electric heating tube cannot be turned on for heating, which can effectively prevent accidents such as dry burning. The electric boiling water kettle is equipped with temperature setting, temperature display and temperature control functions, which brings convenience to users who need different water temperatures. The electric boiling water boiler is equipped with an anti-electricity device, which brings a safe environment for users to use electricity.

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 figure is an eight-bit single-chip microcomputer of Microchip Company of the United States. Example is PIC16C57.

The device includes a pressure switch and a single chip microcomputer input and output circuit. The pressure switch is installed at the bottom of the container. One end of the pressure switch is connected to the I/O input terminal of the microcontroller, and the other end is grounded. The pressure switch is adjusted to close when the container has more than 0.5 liters of water. The I/O input terminal of the single-chip microcomputer is connected with a group of light touch keys and connected with the positive pole of the power supply through a resistor, and the common end of the light touch keys is grounded. The soft touch keys in the embodiment include a start key, a close key, a temperature rise setting key, a temperature drop setting key and a reset key. The I/O input terminal of the single-chip microcomputer is also respectively connected with the zero-ground potential difference detection circuit, the fire wire and the zero-wire current difference detection circuit and the A/D temperature control circuit, and the zero-ground potential difference detection circuit is connected to the ground wire It is composed of transformers, rectifier tubes, voltage regulator tubes, voltage regulator capacitors and Darlington tubes connected step by step between the neutral line. The output end of the Darlington tube is connected to the I/O input end of the single-chip microcomputer. The so-called Darlington tube is composed of Composed of two triodes, the base of the front-stage triode is the input end of the Darlington tube, the emitter of the front-stage triode is connected to the base of the rear-stage triode, and the collectors of the front and back two-stage triodes are connected in parallel as the output end of the Darlington tube. The I/O input terminals of the single-chip microcomputer are connected, and the emitter of the subsequent triode is grounded. The detection device for the potential difference between the ground wire and the neutral wire provides a signal to the single-chip microcomputer chip that the basic insulation of the electric heating tube and the ground wire fail simultaneously or the ground wire is electrified. The fire wire leakage detection circuit fire wire and zero wire current difference detection device is composed of a double operational amplifier integrated circuit and a magnetic ring coil connected, the live wire and the neutral wire pass through the magnetic ring coil, and the dual operational amplifier integrated circuit is connected to the I/O input terminal of the single chip microcomputer. connected, the current difference detection circuit between the live wire and the neutral wire provides the leakage signal of the electric heating tube to the single-chip microcomputer chip. The A/D temperature control circuit is composed of a thermistor and an A/D circuit, and the A/D temperature control circuit is connected with the I/O input terminal of the single-chip microcomputer, and outputs a temperature digital signal to the single-chip microcomputer. The I/O output terminals of the single-chip microcomputer are respectively connected with the liquid crystal display screen, the light-emitting diode and the triode switch circuit, and the normally open contacts of the relay connected with the triode switch circuit are respectively connected with the live wire and the neutral wire inlet and outlet terminals connected to the electric heating tube, The normally closed contact is connected with the input and output ends of the ground wire connected to the electric heating tube.

Claims (3)

1, a kind of intelligent control circuit of electro-heat water boiler, comprise pressure switch and single-chip microcomputer imput output circuit, it is characterized in that pressure switch is installed in container bottom, pressure switch one end is connected with the single-chip processor i/o input, other end ground connection, pressure switch closure when pressure switch is adjusted to container and has water more than 0.5 liter, single-chip processor i/o input and one group touch key, the zero line-ground wire potential difference testing circuit, live wire is connected with the A/D temperature control circuit with the neutral line current difference detecting circuit, the single-chip processor i/o output respectively with LCDs, light emitting diode is connected with transistor switching circuit, the contact of the relay that is connected with transistor switching circuit respectively with the live wire that is connected electric heating tube, zero line is connected with the in-out end of ground wire.

2, a kind of intelligent control circuit of electro-heat water boiler according to claim 1, it is characterized in that the zero line-ground wire potential difference testing circuit is connected to form step by step by the transformer, rectifying tube, voltage-stabiliser tube, electric capacity of voltage regulation and the Darlington transistor that are connected across between ground wire and zero line, the Darlington transistor output is connected with the single-chip processor i/o input.

3, a kind of intelligent control circuit of electro-heat water boiler according to claim 1, it is characterized in that live wire and neutral line current difference detecting circuit are connected to form by double operational integrated circuit and magnetic ring coil, live wire and zero line pass magnetic ring coil, and the double operational integrated circuit is connected with the single-chip processor i/o input.

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